Document:

Warrant to Purchase Series F Preferred Stock

 Exhibit 10.14 
  
 THE SECURITIES REPRESENTED BY THIS WARRANT HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AND HAVE BEEN ACQUIRED FOR
INVESTMENT AND NOT WITH A VIEW TO, OR IN CONNECTION WITH, THE SALE OR DISTRIBUTION THEREOF. NO SUCH SALE OR DISTRIBUTION MAY BE EFFECTED WITHOUT AN EFFECTIVE REGISTRATION STATEMENT RELATED THERETO OR AN OPINION OF COUNSEL IN A FORM SATISFACTORY TO
THE COMPANY THAT SUCH REGISTRATION IS NOT REQUIRED UNDER THE SECURITIES ACT OF 1933 
  

  

	 Warrant No. WPF-3
	  	 Number of Shares: 770

	 Date of Issuance: September 5, 2003
	  	 (subject to adjustment)

  
 XCYTE THERAPIES,
INC. 
  
 Series F Preferred Stock Purchase Warrant

  
 Xcyte Therapies, Inc., a Delaware corporation (the
“Company”), for value received, hereby certifies that Oxford Finance Corporation, or its registered assigns (the “Registered Holder”), is entitled, subject to the terms set forth below, to purchase from the Company, at any
time after the date hereof and on or before the Expiration Date (as defined in Section 7 below), up to 770 shares of Series F Preferred Stock of the Company (“Preferred Stock”), at a purchase price of $2.78 per share. The shares
purchasable upon exercise of this Warrant and the purchase price per share, as adjusted from time to time pursuant to the provisions of this Warrant, are hereinafter referred to as the “Warrant Stock” and the ‘Purchase
Price,” respectively. 
  
 1. Exercise.

  
 (a) Manner of Exercise. This Warrant may
be exercised by the Registered Holder, in whole or in part, by surrendering this Warrant, with the purchase/exercise form appended hereto as Exhibit A duly executed by such Registered Holder or by such Registered Holder’s duly authorized
attorney, at the principal office of the Company, or at such other office or agency as the Company may designate, accompanied by payment in full of the Purchase Price payable in respect of the number of shares of Warrant Stock purchased upon such
exercise. The Purchase Price may be paid by cash, check, wire transfer or by the surrender of promissory notes or other instruments representing indebtedness of the Company to the Registered Holder. 
  
 (b) Effective Time of Exercise. Each exercise of this
Warrant shall be deemed to have been effected immediately prior to the close of business on the day on which this Warrant shall have been surrendered to the Company as provided in Section 1(a) above. At such time, the person or persons in whose name
or names any certificates for Warrant Stock shall be issuable upon such exercise as provided in Section 1(d) below shall be deemed to have become the holder or holders of record of the Warrant Stock represented by such certificates. 
  
 (c) Net Issue Exercise. 
  
 (i) In lieu of exercising this Warrant in the manner provided above in
Section 1(a), the Registered Holder may elect to receive shares equal to the value of this Warrant 

 
(or the portion thereof being canceled) by surrender of this Warrant at the principal office of the Company together with notice of such election on the
purchase/exercise form appended hereto as Exhibit A duly executed by such Registered Holder or such Registered Holder’s duly authorized attorney, in which event the Company shall issue to such Registered Holder a number of shares of
Warrant Stock computed using the following formula: 
  
 X=
Y(AB) 
 A 
  

		
	 Where
	  	 X = The number of shares of Warrant Stock to be issued to the Registered Holder.

		
	 	  	 Y = The number of shares of Warrant Stock purchasable under this Warrant (at the date of such
calculation).

		
	 	  	 A = The fair market value of one share of Warrant Stock (at the date of such calculation).

		
	 	  	 B = The Purchase Price (as adjusted to the date of such calculation).

  
 (ii) For purposes of
this Section 1(c), the fair market value of Warrant Stock on the date of calculation shall mean with respect to each share of Warrant Stock: 
  
 (A) if the exercise is in connection with an initial public offering of the Common Stock of the Company (the “Common Stock”), and
if the Company’s Registration Statement relating to such public offering has been declared effective by the Securities and Exchange Commission, then the fair market value shall be the product of (x) the initial “Price to Public” per
share specified in the final prospectus with respect to the offering and (y) the number of shares of Common Stock into which each share of Warrant Stock is convertible at the date of calculation; 
  
 (B) if this Warrant is exercised after, and not in connection with, the
Company’s initial public offering, and the Company’s Common Stock is traded on a securities exchange or The Nasdaq Stock Market or actively traded over the counter: 
  
 (1) if the Company’s Common Stock is traded on a securities exchange or The Nasdaq Stock Market, the fair market value
shall be decreed to be the product of (x) the average of the closing prices over a 30-day period ending three days before the date of calculation and (y) the number of shares of Common Stock into which each share of Warrant Stock is convertible on
such date; or 
  
 (2) if the Company’s Common Stock is
actively traded over the counter, the fair market value shall be deemed to be the product of (x) the avenge of the closing bid or sales price (whichever is applicable) over the 30-day period ending three days before the date of calculation and (y)
the number of shares of Common Stock into which each share of Warrant Stock is convertible on such date; or 
  

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 (C) if neither (A) nor (B) is applicable, the fair market value of Warrant Stock shall be at the highest
price per share which the Company could obtain on the date of calculation from a willing buyer (not a current employee or director) for shares of Warrant Stock sold by the Company, from authorized but unissued shares, as determined in good faith by
the Board of Directors, unless the Company is at such time subject to an acquisition as described in Section 7(b) below, in which case the fair market value of Warrant Stock shall be deemed to be the value received by the holders of such stock
pursuant to such acquisition. 
  
 (d) Delivery to Registered
Holder. As soon as practicable after the exercise of this Warrant in whole or in part, and in any event within ten (10) days thereafter, the Company at its expense will cause to be issued in the name of, and delivered to, the
Registered Holder, or as such Registered Holder (upon payment by such Registered Holder of any applicable transfer taxes) may direct: 
  
 (i) a certificate or certificates for the number of shares of Warrant Stock to which such Registered Holder shall be entitled, and 
  
 (ii) in case such exercise is in part only, a new warrant or warrants (dated
the date hereof) of like tenor, calling in the aggregate on the face or faces thereof for the number of shares of Warrant Stock equal (without giving effect to any adjustment therein) to the number of such shares called for on the face of this
Warrant minus the number of such shares purchased by the Registered Holder upon such exercise as provided in Section 1(a) or 1(c) above. 
  
 2. Adjustments. 
  
 (a) Redemption or Conversion of Preferred Stock. If all of the Preferred Stock is redeemed or converted into shares of Common Stock,
then this Warrant shall automatically become exercisable for that number of shares of Common Stock equal to the number of shares of Common Stock that would have been received if this Warrant had been exorcised in full and the shares of Preferred
Stock received thereupon had been simultaneously converted into shares of Common Stock immediately prior to such event, and the Exercise Price shall be automatically adjusted to equal the number obtained by dividing (i) the aggregate Purchase Price
of the shares of Preferred Stock for which this Warrant was exercisable immediately prior to such redemption or conversion, by (ii) the number of shares of Common Stock for which this Warrant is exercisable immediately after such redemption or
conversion. 
  
 (b) Stock Splits and
Dividends. If outstanding shares of the Company’s Preferred Stock shall be subdivided into a greater number of shares or a dividend in Preferred Stock shall be paid in respect of Preferred Stock, the Purchase Price in effect
immediately prior to such subdivision or at the record date of such dividend shall simultaneously with the effectiveness of such subdivision or immediately after the record date of such dividend be proportionately reduced. If outstanding shares of
Preferred Stock shall be combined into a smaller number of shares, the Purchase Price in effect immediately prior to such combination shall, simultaneously with the effectiveness of such combination, be proportionately increased. When any adjustment
is required to be made in the Purchase Price, the number of shares of Warrant Stock purchasable upon the exercise of this Warrant shall be changed to the number determined by dividing (i) an amount equal to the number of shares issuable upon the
exercise of this Warrant immediately prior to such adjustment, multiplied by the Purchase Price in effect immediately prior to such adjustment, by (ii) the Purchase Price in effect immediately after such adjustment. 
  

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 (c) Reclassification, Etc. In case there occurs any reclassification or change of the
outstanding securities of the Company or of any reorganization of the Company (or any other corporation the stock or securities of which are at the time receivable upon the exercise of this Warrant) or any similar corporate reorganization on or
after the date hereof, then and in each such case the Registered Holder, upon the exercise hereof at any time after the consummation of such reclassification, change, or reorganization shall be entitled to receive, in lieu of the stock or other
securities and property receivable upon the exercise hereof prior to such consummation, the stock or other securities or property to which such Registered Holder would have been entitled upon such consummation if such Registered Holder had exercised
this Warrant immediately prior thereto, all subject to further adjustment pursuant to the provisions of this Section 2. 
  
 (d) Adjustment Certificate. When any adjustment is required to be made in the Warrant Stock or the Purchase Price pursuant to this Section
2, the Company shall promptly mail to the Registered Holder a certificate setting forth (i) a brief statement of the facts requiring such adjustment, (ii) the Purchase Price after such adjustment and (iii) the kind and amount of stock or other
securities or property into which this Warrant shall be exercisable after such adjustment. 
  
 (e) Acknowledgment. In order to avoid doubt, it is acknowledged that the holder of this Warrant shall be entitled to the benefit of all adjustments in the number of shares of Common Stock of the
Company issuable upon conversion of the Preferred Stock of the Company which occur prior to the exercise of this Warrant, including without limitation, any increase in the number of shares of Common Stock issuable upon conversion as a result of a
dilutive issuance of capital stock. 
  
 3.
Transfers. 
  
 (a) Unregistered
Security. Each holder of this Warrant acknowledges that this Warrant, the Warrant Stock and the Common Stock of the Company have not been registered under the Securities Act of 1933, as amended (the “Securities Act”,
and agrees not to sell, pledge. distribute, offer for sale, transfer or otherwise dispose of this Warrant, any Warrant Stock issued upon its exercise or any Common Stock issued upon conversion of the Warrant Stock in the absence of (i) an effective
registration statement under the Securities Act as to this Warrant, such Warrant Stock or such Common Stock and registration or qualification of this Warrant, such Warrant Stock or such Common Stock under any applicable U.S. federal or state
securities law then in effect, or (ii) an exemption from registration or qualification under the Securities Act. Each certificate or other instrument for Warrant Stock issued upon the exercise of this Warrant shall bear a legend substantially to the
foregoing effect. 
  
 (b) Transferability.
Subject to the provisions of Sections 3(a) and 6 hereof, this Warrant and all rights hereunder are transferable, in whole or in part, upon surrender of the Warrant with a properly executed assignment (in the form of Exhibit B hereto) at the
principal office of the Company; provided, however, that this Warrant may not be transferred in whole or in part without the prior written consent of the Company. 
  
 (c) Warrant Register. The Company will maintain a register containing the names and addresses of the
Registered Holders of this Warrant. Until any transfer of this Warrant is made in the warrant register, the Company may treat the Registered Holder of this Warrant as the absolute owner hereof for all purposes; provided, however, that
if this Warrant is properly assigned in blank, the Company may (but shall not be required to) treat the bearer hereof as the absolute owner hereof for all purposes, notwithstanding any notice to the contrary. My 

  

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Registered Holder may change such Registered Holder’s address as shown on the warrant register by written notice to the Company requesting such change.

  
 4. No Impairment. The Company will not,
by amendment of its charter or through reorganization, consolidation, merger, dissolution, sale of assets or any other voluntary action, avoid or seek to avoid the observance or performance of any of the terms of this Warrant, but will (subject to
Section 15 below) at all times in good faith assist in the carrying out of all such terms and in the taking of all such action as may be necessary or appropriate in order to protect the rights of the holder of this Warrant against impairment.

  
 5. Representations and Warranties of the Registered
Holder. The Registered Holder hereby represents and warrants to the Company that: 
  
 (a) Authorization. The Registered Holder has full power and authority to enter into this Warrant. The Warrant, when executed and
delivered by the Registered Holder, will constitute a valid and legally binding obligation of the Registered Holder, enforceable in accordance with its terms, except as limited by applicable bankruptcy, insolvency, reorganization, moratorium,
fraudulent conveyance, and any other laws of general application affecting enforcement of creditors’ rights generally, and as limited by laws relating to the availability of specific performance, injunctive relief, or other equitable remedies.

  
 (b) Purchase Entirely for Own Account. This
Warrant is issued to the Registered Holder in reliance upon the Registered Holder’s representation to the Company, which by the Registered Holder’s acceptance of this Warrant, the Registered Holder hereby confirms, that the Warrant to be
acquired by the Registered Holder, the Warrant Stock and the Common Stock to be issued upon the conversion of the Warrant Stock (collectively, the “Securities”) will be acquired for investment for the Registered Holder’s own
account, not as a nominee or agent, and not with a view to the resale or distribution of any part thereof, and that the Registered Holder has no present intention of selling, granting any participation in, or otherwise distributing the same. By
accepting this Warrant, the Registered Holder further represents that the Registered Holder does not presently have any contract, undertaking, agreement or arrangement with any person to sell, transfer or grant participations to such person or to
any third person, with respect to any of the Securities. The Registered Holder has not been formed for the specific purpose of acquiring the Securities. 
  
 (c) Disclosure of Information. The Registered Holder has had an opportunity to discuss the Company’s business, management,
financial affairs and the terms and conditions of the offering of the Securities with the Company’s management and has had an opportunity to review the Company’s facilities. The Registered Holder understands that such discussions, as well
as any written information delivered by the Company to the Registered Holder, were intended to describe the aspects of the Company’s business which it believes to be Material. 
  
 (d) Restricted Securities. The Registered Holder understands that the Securities have not been, and
will not be, registered under the Securities Act, by reason of a specific exemption from the registration provisions of the Securities Act which depends upon, among other things, the bona ride nature of the investment intent and the accuracy of the
Registered Holder’s representations ~ expressed herein. The Registered Holder understands that the Securities are “restricted securities” under applicable U.S. federal and state securities laws and that, pursuant to these laws, the
Registered Holder must hold the Securities indefinitely unless they are registered with the Securities and Exchange Commission and qualified by state authorities, or an exemption from such registration and qualification requirements is available.

  

 5 

 
The Registered Holder acknowledges that the Company has no obligation to register or qualify the Securities for resale. The Registered Holder further
acknowledges that if an exemption from registration or qualification is available, it may be conditioned on various requirements including, but not limited to, the time and manner of sale, the holding period for the Securities, and on requirements
relating to the Company which are outside of the Registered Holder’s control, and which the Company is under no obligation and may not be able to satisfy. 
  

(e) No Public Market. The Registered Holder understands that no public market now exists for any of the securities issued by the
Company, and that the Company has made no assurances that a public market will ever exist for the Securities. 
  
 (f) Accredited or Sophisticated Investor. The Registered Holder is an accredited investor as defined in Rule 501(a) of Regulation D
promulgated under the Securities Act. 
  
 6. Lock-up
Agreement. 
  
 (a) Lock-up Period:
Agreement. In connection with the initial public offering of the Company’s securities and upon request of the Company or the underwriters managing such offering of the Company’s securities, the Registered Holder agrees not
to sell, make any short sale of, loan, grant any option for the purchase of, or otherwise dispose of any securities of the Company (other than those included in the registration) without the prior written consent of the Company or such underwriters,
as the case may be, for such period of time (not to exceed 180 days) from the effective date of such registration as may be requested by the Company or such managing underwriters and to execute an agreement reflecting the foregoing as may be
requested by the underwriters at the time of the Company’s initial public offering. 
  
 (b) Stop-Transfer Instructions. In order to enforce the foregoing covenants, the Company may impose stop-transfer instructions with respect to the securities of the Registered Holder (and the
securities of every other person subject to the restrictions in Section 6(a)). 
  
 (c) Transferees Bound. The Registered Holder agrees that prior to the Company’s initial public offering it will not transfer securities of the Company unless each transferee agrees in writing
to be bound by all of the provisions of this Section 6. 
  
 7.
Termination. This Warrant (and the right to purchase securities upon exercise hereof) shall terminate upon the earliest to occur of the following (the “Expiration Date”): (a) 7 years from the issuance date, (b)
the sale, conveyance or disposal of all or substantially all of the Company’s property or business or the Company’s merger with or into or consolidation with any other corporation (other than a wholly-owned subsidiary of the Company) or
any other transaction or series of related transactions in which more than fifty percent (50%) of the voting power of the Company is disposed of, provided that this Section 7 shall not apply to a merger effected exclusively for the purpose of
changing the domicile of the Company or to an equity financing in which the Company is the surviving corporation, or (c) the closing of a firm commitment underwritten public offering pursuant to a registration statement under the Securities
Act. 
  

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 8. Notices of Certain Transactions. In case: 
  
 (a) the Company shall take a record of the holders of Its Preferred Stock
(or other stock or securities at the time deliverable upon the exercise of this Warrant) for the purpose of entitling or enabling them to receive any dividend or other distribution, or to receive any right to subscribe for or purchase any shares of
stock of any class or any other securities, or to receive any other right, or 
  
 (b) of any capital reorganization of the Company, any reclassification of the capital stock of the Company, any consolidation or merger of the Company with or into another corporation (other than a consolidation or
merger in which the Company is the surviving entity), or any transfer of all or substantially all of the assets of the Company, or 
  
 (c) of the voluntary or involuntary dissolution, liquidation or winding-up of the Company, or 
  
 (d) of any redemption of the Preferred Stock or mandatory conversion of the
Preferred Stock into Common Stock of the Company, 
  
 then, and in each such case,
the Company will mail or cause to be mailed to the Registered Holder of this Warrant a notice specifying, as the case may be, (1) the date on which a record is to be taken for the purpose of such dividend, distribution or right, and stating the
amount and character of such dividend, distribution or right, or (ii) the effective date on which such reorganization, reclassification, consolidation, merger, transfer, dissolution, liquidation, winding-up, redemption or conversion is to take
place, and the time, if any is to be fixed, as of which the holders of record of Preferred Stock (or such other stock or securities at the time deliverable upon such reorganization, reclassification, consolidation, merger, transfer, dissolution,
liquidation, winding-up, redemption or conversion) are to be determined. Such notice shall be mailed at least ten (10) days prior to the record date or effective date for the event specified in such notice. 
  
 9. Reservation of Stock. The Company will at all times
reserve and keep available, solely for the issuance and delivery upon the exercise of this Warrant, such shares of Warrant Stock and other stock, securities and property, as from time to time shall be issuable upon the exercise of this
Warrant. 
  
 10. Exchange of Warrants.
Upon the surrender by the Registered Holder of any Warrant or Warrants, properly endorsed, to the Company at the principal office of the Company, the Company will, subject to the provisions of Section 3 hereof, issue and deliver to or upon the order
of such Registered Holder, at the Company’s expense, a new Warrant or Warrants of like tenor, in the name of such Registered Holder or as such Registered Holder (upon payment by such Registered Holder of any applicable transfer taxes) may
direct, calling in the aggregate on the face or faces thereof for the number of shares of Preferred Stock called for on the face or faces of the Warrant or Warrants so surrendered. 
  

 7 

 11. Replacement of Warrants. Upon receipt of evidence reasonably satisfactory to the
Company of the loss, theft, destruction or mutilation of this Warrant and (in the case of loss, theft or destruction) upon delivery of an indemnity agreement (with surety if reasonably required) in an amount reasonably satisfactory to the Company,
or (in the case of mutilation) upon surrender and cancellation of this Warrant, the Company will issue, in lieu thereof, a new Warrant of like tenor. 
  
 12. No Right as Stockholder. Until the exercise of this Warrant, the Registered Holder of this Warrant shall not have or exercise any
rights by virtue hereof as a stockholder of the Company. 
  
 13.
No Fractional Shares. No fractional shares of Preferred Stock will be issued in connection with any exercise hereunder. In lieu of any fractional shares which would otherwise be issuable, the Company shall pay cash equal to the
product of such fraction multiplied by the fair market value of one share of Preferred Stock on the date of exercise, as determined in good faith by the Company’s Board of Directors. 
  
 14. Amendment or Waiver. Any term of this Warrant may be amended or waived only by an instrument in
writing signed by the party against which enforcement of the amendment or waiver is sought. 
  
 15. Headings. The headings in this Warrant are for purposes of reference only and shall not limit or otherwise affect the meaning of any provision of this Warrant. 
  
 16. Governing Law. This Warrant shall be governed,
construed and interpreted in accordance with the laws of the State of Washington, without giving effect to principles of conflicts of law. 
  
 17. Survival Representations. Unless otherwise set forth in this Warrant, the warranties, representations and covenants of die
Company and the Purchasers contained in or made pursuant to this Warrant shall survive the execution arid delivery of this Warrant. 
  
 18. Transfer; Successors and Assigns. The terms and conditions of this Warrant shall inure to the benefit of and be binding upon the
respective successors and assigns of the parties. Nothing in this Warrant, express or implied, is intended to confer upon any party other than the parties hereto or their respective successors and assigns any rights, remedies, obligations, or
liabilities under or by reason of this Warrant, except as expressly provided in this Warrant. 
  
 19. Counterparts. This Warrant may be executed in two or more counterparts, each of which shall be deemed an original and all of which together shall constitute one instrument. 
  
 20. Attorney’s Fees. If any action at law or in
equity (including arbitration) is necessary to enforce or interpret the terms of any of this Warrant, the prevailing party shall be entitled to reasonable attorney’s fees, costs and necessary disbursements in addition to any other relief to
which such party may be entitled. 
  

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 21. Severability. If one or more provisions of this Warrant are held to be
unenforceable under applicable law, the parties agree to renegotiate such provision in good faith. In the event that the parties cannot reach a mutually agreeable and enforceable replacement for such provision, then (a) such provision shall be
excluded from this Warrant, (b) the balance of this Warrant shall be interpreted as if such provision were so excluded and (c) the balance of this Warrant shall be enforceable in accordance with its terms. 
  
 22. Delays or Omissions. No delay or omission to
exercise any right, power or remedy accruing to any party under this Warrant, upon any breach or default of any other party under this Warrant, shall impair any such right, power or remedy of such non-breaching or non-defaulting party nor shall it
be construed to be a waiver of any such breach or default, or an acquiescence therein, or of or in any similar breach or default thereafter occurring: nor shall any waiver of any single breach or default be deemed a waiver of any other breach or
default theretofore or thereafter occurring. Any waiver, permit, consent or approval of any kind or character on the part of any party of any breach or default under this Warrant, or any waiver on the part of any party of any provisions or
conditions of this Warrant, must be in writing and shall be effective only to the extent specifically set forth in such writing. All remedies, either under this Warrant or by law or otherwise afforded to any party, shall be cumulative and not
alternative. 
  
 23. Notices. Any notice
required or permitted by this Warrant shall be in writing and shall be deemed sufficient upon delivery, when delivered personally or by overnight courier or sent by fax, or 48 hours after being deposited in the U.S. mail, as certified or registered
mail, with postage prepaid, addressed to the party to be notified at such party’s address as set forth on the signature page, or as subsequently modified by written notice. 
  
 24. Entire Agreement. This Warrant, and the documents referred to herein constitute the entire
agreement between the parties hereto pertaining to the subject matter hereof, and any and all other written or oral agreements relating to the subject matter hereof existing between the parties hereto are expressly canceled. 
  

	 XCYTE THERAPIES, INC.

		
	 By:
	 	 /s/ Ronald J. Berenson

	 	 	 Ronald J. Berenson. M.D., President

  

	 Address:
	 	 1124 Columbia Street
 Suite 130
 Seattle, WA 98104

	
	 Fax Number: (206) 262-0900

  

 9 

 Accepted and Agreed: 
  
 REGISTERED HOLDER 
  

	 /s/ Michael J. Altenburger

	 Oxford Finance Corporation

		
	 Address:
	 	 l33 North Fairfax Street
 Alexandria, VA 22314

	
	 Fax Number (703) 519-5225

 EXHIBIT A 
  
 PURCHASE/EXERCISE FORM 
  

	 To:
	  	Xcyte Therapies, Inc.	  	Dated:

  
 The undersigned,
pursuant to the provisions set forth in the attached Warrant No. WPF-3, hereby irrevocably elects to (a) purchase                      shares
of the Preferred Stock covered by such Warrant and herewith makes payment of $                    , representing the full purchase price for
such shares at the price per share provided for in such Warrant, or (b) exercise such Warrant for              shares purchasable under the Warrant pursuant to the Net Issue Exercise
provisions of Section 1(c) of the Warrant. 
  
 The undersigned
acknowledges that it has reviewed the representations and warranties contained in Section 5 of the Warrant and by its signature below hereby makes such representations and warranties to the Company as of the date hereof. 
  

	 Signature:

	 Name (print):

	 Title (if applic.):

	 Company (if applic.):

 EXHIBIT B 
  

ASSIGNMENT FORM 
  
 FOR VALUE RECEIVED,
                                        
                                 hereby sells, assigns and transfers all of the rights
of the undersigned under the attached Warrant with respect to the number of shares of Series F Preferred Stock covered thereby set forth below, unto: 
  

	 Name of Assignee

	  	Address/Fax Number

	  	No. of Shares

	 	  	 	  	 
	 	  	 	  	 

  

	 Dated:

	 	 Signature:
	 	  

	 	 	 	 	  

	 	 	 Witness:Senior Loan and Security Agreement dated July 1, 1999

 Exhibit 10.15 
  
 SENIOR LOAN AND SECURITY AGREEMENT NO. 6261 
  
 THIS SENIOR LOAN AND SECURITY AGREEMENT NO. 6261 (this “Security Agreement”) is dated as of July 1, 1999 between
XCYTE THERAPIES, NC., a Delaware corporation (“Borrower”) and PHOENIX LEASING INCORPORATED, a California corporation (“Lender”). 
  
 RECITALS 
  
 A. Borrower desires to borrow from Lender in one or more borrowings the Commitment amount as defined in Section 3(a)(ii) below, and Lender desires to
loan, subject to the terms and conditions herein set forth, such amount to Borrower (each, a “Loan” and collectively, the “Loans”). Such borrowings shall be evidenced by one or more Senior Secured Promissory Notes (each, a
“Note” and collectively, the “Notes”), in the form attached hereto. 
  
 B. As security for Borrower’s obligations to Lender under this Security Agreement, the Notes and any other agreement between Borrower and Lender, Borrower will grant to Lender hereunder a first priority security
interest in certain of its equipment, machinery, fixtures, other items and intangibles, and also certain custom use equipment, installation and delivery costs, purchase tax, toolings, software and other items generally considered fungible or
expendable (“Soft Costs”) whether now owned by Borrower or hereafter acquired, and all substitutions and replacements of and additions, improvements, accessions and accumulations to said equipment, machinery and fixtures and other items,
together with all rents, issues, income, profits and proceeds therefrom which is described on the Note attached hereto or any subsequently-executed Note entered into by Lender and Borrower and which incorporates this Security Agreement by reference
(collectively, the “Collateral”). 
  
 NOW, THEREFORE,
THE PARTIES AGREE AS FOLLOWS: 
  
 SECTION 1. TERM OF
AGREEMENT. The term of this Security Agreement begins on the date set forth above and shall continue thereafter and be in effect so long as and at any time any Note entered into pursuant to this Security Agreement is in effect. The Term and
monthly payment amount payable with respect to each item of Collateral shall be as set forth in and as stated in the respective Note(s). The terms of each Note hereto are subject to all conditions and provisions of this Security Agreement as it may
at any time be amended. Each Note shall constitute a separate and independent Loan and contractual obligation of Borrower and shall incorporate the terms and conditions of this Security Agreement and any additional provisions contained in such Note.
In the event of a conflict between the terms and conditions of this Security Agreement and any provisions of such Note, the provisions of such Note shall prevail with respect to such Note only. 

 SECTION 2. NON-CANCELABLE LOAN. This Security Agreement and each Note cannot be canceled or
terminated except as expressly provided herein. Borrower agrees that its obligations to pay all monthly payment amounts and other sums payable hereunder (and under any Note) and the rights of Lender and any assignee in and to such monthly payment
amounts and other sums, are absolute and unconditional and are not subject to any abatement, reduction, setoff, defense, counterclaim or recoupment due or alleged to be due to, or by reason of, any past, present or future claims which Borrower may
have against Lender, any assignee, the manufacturer or seller of the Collateral, or against any person for any reason whatsoever. 
  
 SECTION 3. LENDER COMMITMENT. (a) General Terms. Subject to the terms and conditions of this Security Agreement, Lender hereby agrees to
make one or more senior secured Loans to Borrower, subject to the following conditions: (i) each Loan shall be evidenced by a Note; (ii) the total principal amount of the Loans shall not exceed $1,000,000 in the aggregate (the
“Commitment”) provided that no more than 20% of the amount of the utilized Commitment may be used to finance Soft Costs; (iii) the amount of each Loan shall be at least $25,000 except for a final Loan which may be less than $25,000; (iv)
Lender shall not be obligated to make any Loan after August 31, 2000; (v) at the time of each Loan, no Event of Default or event which with the giving of notice or passage of time, or both, could become an Event of Default shall have occurred, as
reasonably determined by Lender, and certified by Borrower; (vi) at the time of each Loan, Borrower has reimbursed Lender for all UCC filing and search costs, inspection and labeling costs, and appraisal fees, if any; (vii) for each Loan, Borrower
shall present to Lender a list of proposed Collateral for approval by Lender in its sole discretion; (viii) for each Loan, Borrower shall have provided Lender with each of the closing documents described in Exhibit A hereto (which documents shall be
in form and substance reasonably acceptable to Lender); (ix) Borrower is performing substantially in accordance with its business plan referred to as “Xcyte Therapies Cash Position” labeled Budget 99 to 00 Revised .xls and “Xctye
Therapies Cash Flow Statement” labeled Revised for 3.16.99 Board Meeting” (the “Business Plan”) (all quarterly figures will be prorated to monthly), as may be amended from time to time in form and substance acceptable to Lender;
(x) there shall be no material adverse change in Borrower’s condition, financial or otherwise, that would materially impair the ability of Borrower to meet its payment and other obligations under this Loan (a “Material Adverse
Effect”) as reasonably determined by Lender, and Borrower so certifies, from (yy) the date of the most recent financial statements delivered by Borrower to Lender to (zz) the date of the proposed Loan; (xi) prior to payment in full of all
Notes, Borrower shall not offer any loan secured by any equipment, furniture or fixtures to any other person or entity other than Lender, unless Lender declines to finance such transaction or Borrower and Lender are unable to agree on the terms of
such financing; (xii) Borrower shall use the proceeds of all Loans hereunder to purchase or reimburse the purchase of Collateral; (xiii) all Collateral has been marked and labeled by Lender or Lender’s agent; and (xiv) Lender has received in
form and substance acceptable to Lender: (a) Borrower’s interim financial statements signed by a financial officer of Borrower; and (b) complete copies of the Borrower’s audit reports for its most recent fiscal year when completed, which
shall include at least Borrower’s balance sheet as of the close of such year, and Borrower’s statement of income and retained earnings and of changes in financial position for such year, prepared on a consolidated basis and certified by
independent public accountants. Such certificate shall not be qualified or limited because of restricted or limited examination by such 

  

 2 

 
accountant of any material portion of the company’s records. Such reports shall be prepared in accordance with generally accepted accounting principles
and practices consistently applied. 
  
 (b) The Notes. Each
Loan shall be evidenced by a Note which may not be prepaid in whole or in part. Each Note shall bear interest and be payable at the times and in the manner provided therein. Following payment of the Indebtedness related to each Note, Lender shall
promptly return such Note, marked “canceled,” to Borrower. 
  
 SECTION 4. SECURITY INTERESTS. (a) Borrower hereby grants to Lender a first security interest in all Collateral; (b) This Security Agreement secures (i) the payment of the principal of and interest on the Notes and all other sums due
thereunder and under this Security Agreement (the “Indebtedness”) and (ii) the performance by Borrower of all of its other covenants now or hereafter existing under the Notes, this Security Agreement and any other obligation owed by
Borrower to Lender (the “Obligations”). 
  
 SECTION
5. BORROWER’S REPRESENTATIONS AND WARRANTIES. Borrower represents and warrants that (a) it is in good standing under the laws of the state of its formation, duly qualified to do business and will remain duly qualified during the term of
each Loan in each state where necessary to carry on its present business and operations, including the jurisdiction(s) where the Collateral will be located as specified on each Exhibit A to each Note, except where failure to be so qualified would
not have a Material Adverse Effect; (b) it has full authority to execute and deliver this Security Agreement and the Notes and perform the terms hereof and thereof, and this Security Agreement and the Notes have been duly authorized, executed and
delivered and constitute valid and binding obligations of Borrower enforceable in accordance with their terms; (c) the execution and delivery of this Security Agreement and the Notes will not contravene any law, regulation or judgment affecting
Borrower or result in any breach of any material agreement or other instrument binding on Borrower; (d) no consent of Borrower’s shareholders or holder of any indebtedness, or filing with, or approval of, any governmental agency or commission,
which has not already been obtained or performed, as appropriate, is a condition to the performance of the terms of this Security Agreement or the Notes; (e) there is no action or proceeding pending or threatened against Borrower before any court or
administrative agency which might have a Material Adverse Effect on the business, financial condition or operations of Borrower; (f) at the time any Loan is made hereunder, Borrower owns and will keep all of the Collateral free and clear of all
liens, claims and encumbrances, and, except for this Security Agreement, there is no deed of trust, mortgage, security agreement or other third party interest against any of the Collateral other than Permitted Liens (as defined below); (g) at the
time any Loan is made hereunder, Borrower has good and marketable title to the Collateral; (h) at the time any Loan is made hereunder, all Collateral has been received, installed and is ready for use and is satisfactory in all respects for the
purposes of this Security Agreement; (i) the Collateral is, and will remain at all times under applicable law, removable personal property, which is free and clear of any lien or encumbrance except in favor of Lender other than Permitted Liens (as
defined below), notwithstanding the manner in which the Collateral may be attached to any real property; (j) all credit and financial information submitted to Lender herewith or at any other time is and will at the time given be true and correct in
all material respects; and (k) the security interest granted to Lender hereunder is a first priority security interest, and (I) on or before January 1, 2000, Borrower’s computer system shall be Year 

  

 3 

 
2000 performance compliant and will thus be able to accurately process date data from, into and between the twentieth and twenty-first centuries including
leap year calculations. “Permitted Liens” shall mean and include: (i) liens for taxes or other governmental charges not at the time delinquent or thereafter payable without penalty or being contested in good faith; and (ii) liens of
carriers, warehousemen, mechanics, materialmen, vendors, landlords and other liens arising by operation of law incurred in the ordinary course of business. 
  
 SECTION 6. METHOD AND PLACE OF PAYMENT. Borrower shall pay to Lender, at such address as Lender specifies in writing, all amounts payable to it
under this Security Agreement and the Notes. 
  
 SECTION 7.
LOCATION; INSPECTION; LABELS. All of the Collateral shall be located at the address (the “Collateral Location”) shown on Exhibit A to each Note and shall not be moved unless Borrower has provided Lender with written notice of the
change in location and Lender has acknowledged receipt of the notice. All of the records regarding the Collateral shall be located at 2203 Airport Way South, Suite 300, Seattle, WA 98134, or such other location of which Borrower has given notice to
Lender in accordance with this Security Agreement. Lender shall have the right to inspect Collateral, including records relating thereto, and Borrower’s books and records at any time (upon reasonable notification) during regular business hours,
such books and records to be maintained in accordance with generally accepted accounting principles. Borrower shall be responsible for all labor, material and freight charges incurred in connection with any removal or relocation of Collateral which
is requested by Borrower and consented to by Lender, as well as for any charges due to the installation or moving of the Collateral. Payments under the Notes and under this Security Agreement shall continue during any period in which the Collateral
is in transit during a relocation. During Borrower’s regular business hours and upon at least two days’ notice to Borrower, Lender or its agent shall mark and label Collateral, which labels (to be provided by Lender) shall state that such
Collateral is subject to a security interest of Lender, and Borrower shall keep such labels on the Collateral as so labeled. 
  
 SECTION 8. COLLATERAL MAINTENANCE. (a) General. Upon reasonable notice, Borrower will permit Lender to inspect each item of Collateral and
its maintenance records during Borrower’s regular business hours. Borrower will at its sole expense comply with all applicable laws, rules, regulations, requirements and orders with respect to the use, maintenance, repair, condition, storage
and operation of each item of Collateral. Any addition or improvement that is so required or cannot be so removed will immediately become Collateral of Lender. (b) Service and Repair. Borrower will at its sole expense maintain and service and
repair any damage to each item of Collateral in a manner consistent with prudent industry practice and Borrower’s own practice so that such item of Collateral is at all times (i) in the same condition as when delivered to Borrower, except for
ordinary wear and tear, and (ii) in good operating order for the function intended by its manufacturer’s warranties and recommendations. 
  
 SECTION 9. LOSS OR DAMAGE. Borrower assumes the entire risk of loss to the Collateral through use, operation or otherwise. Borrower hereby
indemnifies and holds harmless Lender from and against all claims, loss of Loan payments, costs, damages, and expenses relating to or resulting from any loss, damage or destruction of the Collateral, any such occurrence being hereinafter called a
“Casualty Occurrence.” Notwithstanding any Casualty Occurrence, the Loan 

  

 4 

 
to which such casualtied item of Collateral is subject shall continue in full force and effect without any abatement in the monthly payment due. Borrower
shall, at its election, (a) no later than thirty (30) days after such Casualty Occurrence repair the Collateral returning it to good operating condition, (b) no later than thirty (30) days after such Casualty Occurrence replace the Collateral with
Collateral acceptable to Lender in its reasonable discretion, in good condition and repair taking all steps required by Lender to perfect Lender’s first priority security interest therein, which replacement Collateral shall be subject to the
terms of this Security Agreement, or (c) on the next regular monthly payment date which falls after such thirty (30) days, or if there is no such payment date, thirty (30) days after such Casualty Occurrence pay to Lender an amount equal to the
Balance Due (as defined below) for each lost or damaged item of Collateral. The Balance Due for each such item is the sum of: (i) all amounts for each item which may be then due or accrued to the payment date, plus (ii) as of such payment date, an
amount equal to the product of the fraction specified below times the sum of all remaining payments under the respective Note, including the amount of any mandatory or optional payment required or permitted to be paid by Borrower to Lender at the
maturity of the Note discounting to present value the amounts in (ii) at a rate of 6% per annum compounded monthly on the basis of a 360 day year (“Discount Rate”). The numerator of the fraction shall be the collateral value (as set forth
on the applicable Note) of the item and the denominator shall be the aggregate collateral value of all items under the Note. Upon the making of such payments, Lender shall release such item of Collateral from its lien hereunder. 
  
 SECTION 10. INSURANCE. Borrower at its expense shall keep the
Collateral insured against all risks of physical loss for at least the replacement value of the Collateral and in no event for less than the amount payable following a Casualty Occurrence (as provided in Section 9). Such insurance shall provide for
a loss payable endorsement to Lender and/or any assignee of Lender. If there is no event of default by Borrower, any insurance proceeds received by Lender shall be released by Lender for application to the costs incurred by Borrower to repair the
Collateral. Borrower shall maintain commercial general liability insurance, including products liability and completed operations coverage, with respect to loss or damage for personal injury, death or property damage in an amount not less than
$2,000,000 in the aggregate, naming Lender and/or Lender’s assignee as additional insured. Such insurance shall contain insurer’s agreement to give thirty (30) days’ advance written notice to Lender before cancellation or material
change of any policy of insurance. Borrower will provide Lender and any assignee of Lender with a certificate of insurance from the insurer evidencing Lender’s or such assignee’s interest in the policy of insurance. Such insurance shall
cover any Casualty Occurrence to any unit of Collateral. Notwithstanding anything in Section 9 or this Section 10 to the contrary, this Security Agreement and Borrower’s obligations hereunder shall remain in full force and effect with respect
to any unit of Collateral which is not subject to a Casualty Occurrence. If Borrower fails to provide or maintain insurance as required herein, Lender shall have the right, but shall not be obligated, to obtain such insurance. In that event,
Borrower shall pay to Lender the cost thereof. 
  
 SECTION 11.
MISCELLANEOUS AFFIRMATIVE COVENANTS. So long as any portion of the Indebtedness is unpaid and as long as any of the Obligations are outstanding Borrower will: (a) duly pay all governmental taxes and assessments at the time they become due and
payable; provided, however, Borrower may contest the same in good faith so long as no payment default by Borrower has occurred and is continuing; (b) comply with all applicable 

  

 5 

 
material governmental laws, rules and regulations relating to its business and the Collateral where a failure to comply would have a Material Adverse Effect;
(c) take no action to adversely affect Lender’s security interest in the Collateral as a first and prior perfected security interest; (d) furnish Lender with its annual audited financial statements within ninety (90) days following the end of
Borrower’s fiscal year, unaudited quarterly financial statements within forty-five (45) days after the end of each fiscal quarter, and within thirty (30) days of the end of each month a financial statement for that month prepared by Borrower,
and including an income statement and balance sheet, all of which shall be certified by an officer of Borrower as true and correct and shall be prepared in accordance with generally accepted accounting principles consistently applied, and such other
information as Lender may reasonably request; and (e) promptly (but in no event more than five (5) days after the occurrence of such event) notify Lender of any change in Borrower’s condition during the commitment period which constitutes a
Material Adverse Effect, and of the occurrence of any Event of Default. 
  
 SECTION 12. INDEMNITIES. Borrower will protect, indemnify and save harmless Lender and any assignees from and against all liabilities, obligations, claims, damages, penalties, causes of action, costs and expenses (including
reasonable attorneys’ fees and expenses), imposed upon or incurred by or asserted against Lender or any assignee of Lender by Borrower or any third party by reason of the occurrence or existence (or alleged occurrence or existence) of any act
or event relating to or caused by any portion of the Collateral, or its purchase, acceptance, possession, use, maintenance or transportation, including without limitation, consequential or special damages of any kind, any failure on the part of
Borrower to perform or comply with any of the terms of this Security Agreement or any Note, claims for latent or other defects, claims for patent, trademark or copyright infringement and claims for personal injury, death or property damage,
including those based on Lender’s negligence or strict liability in tort and excluding only those based on Lender’s gross negligence or willful misconduct. In the event that any action, suit or proceeding is brought against Lender by
reason of any such occurrence, Borrower, upon Lender’s request, will, at Borrower’s expense, resist and defend such action, suit or proceeding or cause the same to be resisted and defended by counsel designated and approved by Lender.
Borrower’s obligations under this Section 12 shall survive the payment in full of all the Indebtedness and the performance of all Obligations with respect to acts or events occurring or alleged to have occurred prior to the payment in full of
all the Indebtedness and the performance of all Obligations. 
  
 SECTION 13. TAXES. Borrower does not indemnify Lender for any loss of Lender’s anticipated tax benefits unless the loss arises from an act or omission by the Borrower or from any misrepresentation under the Security Agreement by
the Borrower. Borrower agrees to reimburse Lender (or pay directly if instructed by Lender) and any assignee of Lender for, and to indemnify and hold Lender and any assignee harmless from, all fees (including, but not limited to, license,
documentation, recording and registration fees), and all sales, use, gross receipts, personal property, occupational, value added or other taxes, levies, imposts, duties, assessments, charges, or withholdings of any nature whatsoever, together with
any penalties, fines, additions to tax, or interest thereon (the foregoing collectively “Impositions”), except same as may be attributable to Lender’s income, arising at any time prior to or during the term of any Notes or of this
Security Agreement, or upon termination or early termination of this Security Agreement and levied or imposed upon Lender directly or otherwise by any Federal, state or local government in 

  

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the United States or by any foreign country or foreign or international taxing authority upon or with respect to (a) the Collateral, (b) the exportation,
importation, registration, purchase, ownership, delivery, leasing, financing, possession, use, operation, storage, maintenance, repair, return, sale, transfer of title, or other disposition thereof, (c) the rentals, receipts, or earnings arising
from the Collateral, or any disposition of the rights to such rentals, receipts, or earnings, (d) any payment pursuant to this Security Agreement or the Notes, or (e) this Security Agreement, the Notes or any transaction or any part hereof or
thereof. 
  
 SECTION 14. RELEASE OF LIENS. Upon payment of
all of the Indebtedness and performance of all of the Obligations, Lender shall execute UCC termination statements and such other documents as Borrower shall reasonably request to evidence the release of Lender’s lien relating to the
Collateral. 
  
 SECTION 15. ASSIGNMENT. WITHOUT
LENDER’S PRIOR WRITTEN CONSENT WHICH CONSENT WILL NOT BE UNREASONABLY WITHHELD OR DELAYED, BORROWER SHALL NOT (a) ASSIGN, TRANSFER, PLEDGE, HYPOTHECATE OR OTHERWISE DISPOSE OF THIS SECURITY AGREEMENT, ANY NOTE, ANY COLLATERAL, OR ANY INTEREST
THEREIN, (I,) LEASE OR LEND COLLATERAL OR PERMIT IT TO BE USED BY ANYONE OTHER THAN BORROWER OR BORROWER’S EMPLOYEES, CONTRACTORS AND AGENTS OR (c) MERGE INTO, CONSOLIDATE WITH OR CONVEY OR TRANSFER ITS PROPERTIES SUBSTANTIALLY AS AN ENTIRETY
TO ANY OTHER PERSON OR ENTITY. LENDER MAY ASSIGN ANY OF THE NOTES, THIS SECURITY AGREEMENT OR ITS SECURITY INTEREST IN ANY OR ALL COLLATERAL, OR ANY OR ALL OF THE ABOVE, IN WHOLE OR IN PART TO ONE OR MORE ASSIGNEES OR SECURED PARTIES WITHOUT NOTICE
TO BORROWER. If Borrower is given notice of such assignment it agrees to acknowledge receipt thereof in writing and Borrower shall execute such additional documentation as Lender’s assignee and/or secured party shall reasonably require at
Lender’s expense. Each such assignee and/or secured party shall have all of the rights, but (except as provided in this Section 15) none of the obligations, of Lender under this Security Agreement, unless such assignee or secured party
expressly agrees to assume such obligations in writing. Borrower shall not assert against any assignee and/or secured party any defense, counterclaim or offset that Borrower may have against Lender. Notwithstanding any such assignment, and providing
no Event of Default has occurred and is continuing, Lender, or its assignees, secured parties, or their agents or assigns, shall not interfere with Borrower’s right to quietly enjoy use of Collateral subject to the terms and conditions of this
Security Agreement. Subject to the foregoing, the Notes and this Security Agreement shall inure to the benefit of, and are binding upon, the successors and assignees of the parties hereto. Borrower acknowledges that any such assignment by Lender
will not change Borrower’s duties or obligations under this Security Agreement and the Notes or increase any burden or risk on Borrower. 
  
 SECTION 16. DEFAULT. (a) Events of Default. Any of the following events or conditions shall constitute an “Event of Default”
hereunder: (i) Borrower’s failure to pay any monies due to Lender hereunder or under any Note beyond the tenth (10th) day after the same is due; (ii) Borrower’s failure to comply with its obligations under Section 10 or Section 15; (iii)
any representation or warranty of Borrower made in this Security Agreement or the Notes or in 

  

 7 

 
any other agreement, statement or certificate furnished to Lender in connection with this Security Agreement or the Notes shall prove to have been incorrect
in any material respect when made or given; (iv) Borrower’s failure to comply with or perform any material term, covenant or condition of this Security Agreement or any Note or under any lease or mortgage of real property covering the location
of the Collateral if such failure to comply or perform is not cured by Borrower within thirty (30) days after Borrower knows of the noncompliance or nonperformance or notice from Lender or such longer period that Borrower is diligently attempting to
effect such cure; (v) seizure of any of the Collateral under legal process; (vi) the filing by or against Borrower or any guarantor under any guaranty executed in connection with this Security Agreement (“Guarantor”) of a petition for
reorganization or liquidation under the Bankruptcy Code or any amendment thereto or under any other insolvency law providing for the relief of debtors; (vii) the voluntary or involuntary making of an assignment of a substantial portion of its assets
by Borrower or by any Guarantor for the benefit of its creditors, the appointment of a receiver or trustee for Borrower or any Guarantor or for any of Borrower’s or Guarantor’s assets, the institution by or against Borrower or any
Guarantor of any formal or informal proceeding for dissolution, liquidation, settlement of claims against or winding up of the affairs of Borrower or any Guarantor provided that in the case of all such involuntary proceedings, same are not dismissed
within sixty (60) days after commencement; (viii) the making by Borrower or by any Guarantor of a transfer of all or a material portion of Borrower’s or Guarantor’s assets or inventory not in the ordinary course of business; or (ix) any
default or breach by any Guarantor of any of the terms of its guaranty to Lender in connection with this Security Agreement. 
  
 (b) Remedies. If any Event of Default has occurred, Lender may in its sole discretion exercise one or more of the following remedies with respect
to any or all of the Collateral: (i) declare due any or all of the aggregate sum of all remaining payments under the Notes, including the amount of any mandatory or optional payment required or permitted to be paid by Borrower to Lender at the
maturity of the Notes (“Remaining Payments”); (ii) proceed by appropriate court action or actions either at law or in equity to enforce Borrower’s performance of the applicable covenants of the Notes and this Security Agreement or to
recover all reasonable damages and expenses incurred by Lender by reason of an Event of Default; (iii) except as provided by law, without court order or prior demand, enter upon the premises where the Collateral is located and take immediate
possession of and remove it without liability of Lender to Borrower or any other person or entity; (iv) terminate this Security Agreement and sell the Collateral at public or private sale, or otherwise dispose of, hold, use or lease any or all of
the Collateral in a commercially reasonable manner; or (v) exercise any other right or remedy available to it under applicable law. If Lender has declared due any or all of the Remaining Payments, Borrower will pay immediately to Lender, without
duplication, (A) the Remaining Payments discounted to present value at the Discount Rate, (B) all amounts which may be then due or accrued, and (C) all other amounts due under this Security Agreement and under the Notes (Lender’s Return, as
referred to below, means the amounts described in clauses (A), (B) and (C) above). The net proceeds of any sale or lease of such Collateral will be credited against Lender’s Return. The net proceeds of a sale of the Collateral pursuant to this
Section 16(b) is defined as the sales price of the Collateral less selling expenses, including, without limitation, costs of remarketing the Collateral and all refurbishing costs and commissions paid with respect to such remarketing. The net
proceeds of a lease of the Collateral pursuant to this Section 16(b) is defined as the amount equal to the 

  

 8 

 
monthly payments due under such lease (discounted to present value at the Discount Rate) plus the residual value of the Collateral at the end of the basic
term of such lease, as reasonably determined by Lender, and discounted at the Discount Rate. 
  
 At Lender’s request, Borrower shall assemble the Collateral and make it available to Lender at such time and location as Lender may reasonably designate. Borrower waives any right it may have to redeem the
Collateral. 
  
 Declaration that any or all amounts under this
Security Agreement and/or the Notes are immediately due and payable and Lender’s taking possession of any or all Equipment shall not terminate this Security Agreement or any of the Notes unless Lender so notifies Borrower in writing. None of
the above remedies is intended to be exclusive but each is cumulative and may be enforced separately or concurrently. 
  
 (c) Application of Proceeds. The proceeds of any sale of all or any part of the Collateral and the proceeds of any remedy afforded to Lender by
this Security Agreement shall be paid to and applied as follows: 
  
 First, to the payment of reasonable costs and expenses of suit or foreclosure, if any, and of the sale, if any, including, without limitation, refurbishing costs, costs of remarketing and commissions related to remarketing, all Remedy
Expenses, all expenses, liabilities and advances incurred or made pursuant to this Security Agreement or any Note by Lender in connection with foreclosure, suit, sale or enforcement of this Security Agreement or the Notes, and taxes, assessments or
liens superior to Lender’s security interest granted by this Security Agreement; 
  
 Second, to the payment of all other amounts not described in item Third below due under this Security Agreement and all Notes; 
  

Third, to pay Lender an amount equal to Lender’s Return, to the extent not previously paid by Borrower; and 
  
 Fourth, to the payment of any surplus to Borrower or to whomever may lawfully
be entitled to receive it. 
  
 (d) Effect of Delay: Waiver:
Foreclosure on Collateral. No delay or omission of Lender, in exercising any right or power arising from any Event of Default shall prevent Lender from exercising that right or power if the Event of Default continues. No waiver of an Event of
Default, whether full or partial, by Lender or such holder shall be taken to extend to any subsequent Event of Default, or to impair the rights of Lender in respect of any damages suffered as a result of the Event of Default. The giving, taking or
enforcement of any other or additional security, collateral or guaranty for the payment or discharge of the Indebtedness and performance of the Obligations shall in no way operate to prejudice, waive or affect the security interest created by this
Security Agreement or any rights, powers or remedies exercised hereunder or thereunder. Lender shall not be required first to foreclose on the Collateral prior to bringing an action against Borrower for sums owed to Lender under this Security
Agreement or under any Note. 
  

 9 

 SECTION 17. LATE PAYMENTS. Borrower shall pay Lender a late charge of 10% of any payment owed
Lender by Borrower which is not paid when due (taking into account applicable grace periods), for every month such payment is not paid when due. If such amounts have not been received by Lender at Lender’s place of business or by Lender’s
designated agent by the date such amounts are due under this Security Agreement or the Notes, Lender shall bill Borrower for such charges. Borrower acknowledges that invoices for amounts due hereunder or under the Notes are sent by Lender for
Borrower’s convenience only. Borrower’s non-receipt of an invoice will not relieve Borrower of its obligation to make payments hereunder or under the Notes. 
  
 SECTION 18. PAYMENTS BY LENDER. If Borrower shall fail to make any payment or perform any act required hereunder
(including, but not limited to, maintenance of any insurance required by Section 10), then Lender may, but shall not be required to, after such notice to Borrower as is reasonable under the circumstances, make such payment or perform such act with
the same effect as if made or performed by Borrower. Borrower will upon demand reimburse Lender for all sums paid and all reasonable costs and expenses incurred in connection with the performance of any such act. 
  
 SECTION 19. FINANCING STATEMENTS. Borrower hereby appoints Lender (and
each of Lender’s officers, employees or agents designated by Lender) with full power of substitution by Lender, as Borrower’s attorney, with power to execute and deliver on Borrower’s behalf, financing statements and other documents
necessary to perfect and/or give notice of Lender’s security interest in any of the Collateral. Notwithstanding the above, Borrower will, upon Lender’s request, execute all financing statements pursuant to the Uniform Commercial Code and
all such other documents reasonably requested by Lender to perfect Lender’s security interests hereunder. Borrower authorizes Lender to file financing statements signed only by Lender (where such authorization is permitted by law) at all places
where Lender deems necessary. 
  
 SECTION 20. NATURE OF
TRANSACTION. Lender makes no representation whatsoever, express or implied, concerning the legal character of the transaction evidenced hereby, for tax or any other purpose. 
  
 SECTION 21. SUSPENSION OF LENDER’S OBLIGATIONS. The obligations of Lender hereunder will be suspended to the
extent that Lender is hindered or prevented from complying therewith because of labor disturbances, including but not limited to strikes and lockouts, acts of God, fires, floods, storms, accidents, industrial unrest, acts of war, insurrection, riot
or civil disorder, any order, decree, law or governmental regulations or interference, failure of the manufacturer to deliver any item of Collateral or any cause whatsoever not within the sole and exclusive control of Lender. 
  
 SECTION 22. LENDER’S EXPENSE. Borrower shall pay Lender all
reasonable costs and expenses including reasonable attorney’s fees, litigation expenses and the fees of collection agencies, incurred by Lender (a) in enforcing any of the terms, conditions or provisions hereof and related to the exercise of
its remedies (“Remedy Expenses”), and (b) in connection with any 

  

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bankruptcy or post-judgment proceeding, whether or not suit is filed and, in each and every action, suit or proceeding, including any and all appeals and
petitions therefrom. 
  
 SECTION 23. ALTERATIONS;
ATTACHMENTS. No alterations or attachments shall be made to the Collateral without Lender’s prior written consent, which shall not be given for changes that will adversely affect the reliability and utility of the Collateral or which cannot
be removed without damage to the Collateral, or which in any way decrease the value of the Collateral for purposes of resale or lease. All attachments and improvements to the Collateral shall be deemed to be “Collateral” for purposes of
the Security Agreement, and a first priority security interest therein shall immediately vest in Lender. 
  
 SECTION 24. CHATTEL PAPER. (a) One executed copy of the Security Agreement will be marked “Original” and all other counterparts will be
duplicates. To the extent, if any, that this Security Agreement constitutes chattel paper (as such term is defined in the Uniform Commercial Code as in effect in any applicable jurisdiction) no security interest in the Security Agreement may be
created in any documents other than the “Original.” (b)There shall be only one original of each Note and it shall be marked “Original,” and all other counterparts will be duplicates. To the extent, if any, that any Notes to this
Security Agreement constitutes chattel paper (or as such term is defined in the Uniform Commercial Code as in effect in any applicable jurisdiction) no security interest in any Note(s) may be created in any documents other than the
“Original.” 
  
 SECTION 25. STOCK WARRANT.
Borrower agrees that it will issue to Lender upon execution of this Security Agreement a Warrant in the form of the Warrant Agreement attached hereto as Exhibit B. Borrower and Lender agree that the value of the Warrant hereunder is ten dollars
($10.00). 
  
 SECTION 26. COMMITMENT FEE. Borrower has paid
to Lender a commitment fee (“Fee”) of $10,000. The Fee shall be applied by Lender first to reimburse Lender for all out-of-pocket UCC and other search costs, inspections and labeling costs and appraisal fees, if any, incurred by Lender,
and then proportionally to the first monthly payment for each Note hereunder in the proportion that the Collateral value for such Note bears to Lender’s entire commitment. However, the portion of the Fee which is not applied to such monthly
payments shall be non-refundable except if Lender defaults in its obligation to fund Loans pursuant to Section 3. 
  
 SECTION 27. NOTICES. All notices hereunder shall be in writing, by registered mail, or reliable messenger or delivery service (including overnight
service) and shall be directed, as the case may be, to Lender at 2401 Kerner Boulevard, San Rafael, California 94901, Attention: Asset Management and to Borrower at 2203 Airport Way South, Suite 300, Seattle, WA 98134, Attention: Kathi Cordova,
Director Finance, or at such other address as the parties may notify one another of in writing from time to time. 
  
 SECTION 28. MISCELLANEOUS. (a) Borrower shall provide Lender with such corporate resolutions, financial statements and other documents as Lender
shall reasonably request from time to time. (b) Borrower represents that the Collateral hereunder is used solely for business purposes. (c) Time is of the essence with respect to this Security Agreement. (d) 

  

 11 

 
Borrower acknowledges that Borrower has read this Security Agreement and the Notes, understands them and agrees to be bound by their terms and further agrees
that this Security Agreement and the Notes constitute the entire agreement between Lender and Borrower with respect to the subject matter hereof and supersede all previous agreements, promises, or representations. (e) This Security Agreement and the
Notes may not be changed, altered or modified except by an instrument signed by an officer or authorized representative of Lender and Borrower. (f) Any failure of Lender to require strict performance by Borrower or any waiver by Lender of any
provision herein or in a Note shall not be construed as a consent or waiver of any other breach of the same or any other provision. (g) If any provision of this Security Agreement or any Note is held invalid, such invalidity shall not affect any
other provisions hereof or thereof. (h) The obligations of Borrower to pay the Indebtedness and perform the Obligations shall survive the expiration or earlier termination of this Security Agreement and each Note until all Obligations of Borrower to
Lender have been met and all liabilities of Borrower to Lender and any assignee have been paid in full. (i) Borrower will notify Lender at least 30 days before changing its name, principal place of business or chief executive office. (j) Borrower
will, at its expense, promptly execute and deliver to Lender such documents and assurances (including financing statements) and take such further action as Lender may reasonably request in order to carry out the intent of this Security Agreement and
Lender’s rights and remedies. 
  
 SECTION 29. JURISDICTION
AND WAIVER OF JURY TRIAL. This Security Agreement and each Note shall be deemed to have been made under and shall be governed by the laws of the State of California in all respects, including matters of construction, validity and performance. At
Lender’s sole discretion, option and election, jurisdiction and venue for any legal action between the parties arising out of or relating to this Security Agreement or any Note shall be in the Superior Court of Mann County, California, or, in
cases where federal diversity jurisdiction is available, in the United States District Court for the Northern District of California located in San Francisco, California. BORROWER, TO THE EXTENT IT MAY LAWFULLY DO SO, HEREBY WAIVES ITS RIGHT TO
TRIAL BY JURY IN ANY ACTION BROUGHT ON OR WITH RESPECT TO THIS SECURITY AGREEMENT, ANY NOTE, ANY SECURITY DOCUMENTS, OR ANY OTHER AGREEMENTS EXECUTED IN CONNECTION HEREWITH. 
  
 SECTION 30. END OF LOAN POSITION. (a) General. Borrower shall be required to choose a final payment or Note
extension election (“End of Loan Position”) at the expiration of the first Note’s term. Borrower shall provide written notice of its election to Lender at least 90 days prior to the end of the term of the first Note. That choice shall
be an election of Borrower’s End of Loan Position election for all, but not less than all, of the Collateral under all Notes under the Security Agreement. 
  

In the event Borrower does not provide 90 days’ prior written notice of its election, Borrower shall be deemed to have elected Election No. 2.

  
 (b) End of Loan Position Elections. As its End of Loan
Position, Borrower shall be required to: 
  

 12 

 Election No. 1: Make a final payment equal to 12% of the Note’s original principal amount.

  
 Election No. 2: Extend the Note’s term for an
additional 12 months (“Extended Term”) for a monthly rate of 1.44% of the Note’s original principal amount. 
  
 IN WITNESS WHEREOF, Borrower and Lender have caused this Security Agreement to be executed as of the date and year first above written. 
  

	 PHOENIX LEASING INCORPORATED
	 	 XCYTE THERAPIES, INC.

				
	 By:
	 	  

	 	 By:
	 	 /s/ Ronald Jay Berenson

	 Name:
	 	  

	 	 Name (Print):
	 	 Ronald Jay Berenson

	 Title:
	 	  

	 	 Title:
	 	 President & CEO

			
	 	 	 	 	 HEADQUARTERS LOCATION:

	 	 	 	 	 2203 Airport Way South, Suite 300

	 	 	 	 	 Seattle, WA 98134

	 	 	 	 	 County of King

			
	 	 	 	 	 EXHIBITS AND SCHEDULES:

	 	 	 	 	 Exhibit A—Closing Memorandum

	 	 	 	 	 Exhibit B—Stock Warrant

  

 13 

 EXHIBIT A TO 
 SENIOR LOAN AND SECURITY AGREEMENT NO. 6261 
 DATED JULY 1, 1999 
  
 CLOSING MEMORANDUM 
  

	1.*	Duly executed Senior Loan and Security Agreement. 

  

	2.	Duly executed Senior Security Promissory Note with Exhibit A Collateral description attached. 

  

	3.	Insurance certificates reflecting coverage required under Section 10 of the Senior Loan and Security Agreement. 

  

	4.*	Resolutions of Borrower’s board of directors. 

  

	5.	Real Property Waiver.** 

  

	6.	UCC-1 Financing Statements with respect to the Collateral. 

  

	7.	* Stock warrant. 

  

	8.	UCC search (Lender will obtain). 

  

	9.	Certificate of Chief Financial Officer stating that (i) there are no liens, charges, security interests or other encumbrances that may affect Lender’s right, title and interest
in the Collateral and there are no UCC-1 financing statements filed or in the process of being filed against any of the Collateral, (ii) Borrower is performing according to Borrower’s business plan, (iii) no change which is a Material Adverse
Effect has occurred in the financial condition of Borrower, (iv) no default has occurred, and (v) the representations and warranties in Section 5 of the Senior Loan and Security Agreement are true and correct as if made on the date of the Loan.

  

	10.*	Certificate from the Secretary of State of Borrower’s state of incorporation, and from the state in which Borrower’s chief executive office is located, if different,
stating the Borrower is in good standing or is authorized to transact business, as the case may be, dated not more than thirty days prior to the first Loan (Lender will obtain). 

  

	11.*	Borrower’s Business Plan. 

  

	12.	Borrower’s most recent financial statements. 

  

	13.	List of proposed Collateral. 

  

	14.	Purchase documentation verifying Borrower’s ownership of equipment. 

  

 14 

	15.	See Section 3 of the Senior Loan and Security Agreement for additional conditions to closing. 

  

	16.	Intercreditor Agreement, if applicable. 

  

	*	First Loan only. 

  

	**	Required if any Equipment is a fixture, i.e., attached to real property, or located in certain states. 

  

 15 

 EXHIBIT B TO 
 SENIOR LOAN AND SECURITY AGREEMENT NO. 6261 
  
 FORM OF STOCK WARRANT 
  

 16 

 CORPORATE RESOLUTION TO BORROW 
  
 RESOLVED: That this corporation, XCYTE THERAPIES, INC., borrow funds from PHOENIX LEASING INCORPORATED, a California corporation,
(“Lender”) and grant as collateral for such borrowings such items of personal property and fixtures, and upon such terms and conditions, as the officer or officers hereinafter authorized, in their discretion, may deem necessary or
advisable; and that the aggregate principal amount of borrowings hereunder shall be the sum of $1,000,000 which amount may be exceeded in the future. 
  

	 RESOLVED FURTHER: That:
	  	 	  	 
			
	 Ronald Jay Berenson

	  	 President & CEO

	  	 Ronald Jay Berenson

			
	 or
	  	 	  	 
			
	
 (Print or type name)
	  	
 (Title of Corporate Officer
	  	
 (specimen signature)

  
 of this corporation (this officer or
officers authorized to act pursuant hereto being hereinafter designated as “authorized officers”), are individually authorized, directed and empowered, in the name of this corporation, to execute and deliver to Lender, and Lender is
requested to accept, any notes, security agreements, and other documents or agreements that may be required by Lender in connection with such borrowings. 
  
 RESOLVED FURTHER: That the authorized officers are individually authorized, directed and empowered, in the name of this corporation, to do or cause to be done all such
further acts and things as they shall deem necessary, advisable, convenient, or proper in connection with the execution and delivery of any such notes, security agreements, and other documents or agreements and in connection with or incidental to
the carrying of the same into effect, including without limitation, the execution. acknowledgment, and delivery of all instruments and documents which may reasonably Lender under or in connection with any such borrowing. 
  
 RESOLVED FURTHER: That Lender is authorized to act upon these resolutions until [photocopy
cut off] their revocation is delivered to Lender, and that the authority hereby granted shall apply and effect to the successors in office of the officers herein named. 
  
 I,
                        , Officer of XCYTE THERAPIES, INC., a corporation in [photocopy cut off] the laws of the
State of Delaware, do hereby certify that the foregoing is a full, true and [photocopy cut off] resolutions of the Board of Directors of the said corporation, duly and regularly passed [photocopy cut off] Board of Directors of said
corporation as required by law and by the by-laws of the said [photocopy cut off] the              day of
                                        ,
19            . 
  
 I further certify that said resolutions are still in full force and effect and have not been [photocopy cut off] revoked and that the specimen signatures appearing above are the signatures of the office [photocopy cut off]
sign for this corporation by virtue of the said resolutions. 
  

 17 

 IN WITNESS WHEREOF, I have hereunto set my hand as such Secretary, and affixed the corporate seal of the said
corporation, this              day of
                                        ,
19            . 
  

	 AFFIX CORPORATE
	  	

	 SEAL HERE
	  	 OFFICER OF XCYTE THERAPIES, INC.

		
	 	  	[PERSON WHO SIGNS HERE MUST BE DIFFERENT FROM PERSON(S) WHO SIGNED ABOVE.]

  

 18

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