Document:

Compensation of Named Executive Officers of Curis, Inc.

 Exhibit 10.23 
 Compensation of Named Executive Officers of Curis, Inc. 
 As of March 2, 2007, following are the
base salaries, on an annual basis, of the named executive officers (as defined in Item 402(a)(3) of Regulation S-K) of Curis, Inc.: 
  

				
	 Daniel R. Passeri
	  	$	300,000
	 President and Chief Executive Officer
	  		
		
	 Michael P. Gray
	  	$	285,000
	 Chief Operating Officer and Chief Financial Officer
	  		
		
	 Mark W. Noel
	  	$	200,000
	 Vice President, Technology Management and Business Development
	  		
		
	 Mary Elizabeth Potthoff
	  	$	200,000
	 Vice President, General Counsel
	  		

 In addition, each of the named executive officers listed above is eligible to receive stock
options and stock awards under the 2000 Stock Incentive Plan of Curis, Inc.Compensation of Directors of Curis, Inc.

 Exhibit 10.24 
 Compensation of Directors of Curis, Inc. 
 As of March 2, 2007, cash compensation for
non-employee directors of Curis, Inc. was set at the following amounts: $15,000 as an annual retainer; $1,500 for each board meeting attended in person; and $750 for each telephonic board meeting. Non-employee directors who are members of a
committee of the board of directors receive cash compensation in the amount of $1,500 for each committee meeting attended in person on a day other than a day on which a board meeting is held and $750 for each telephonic committee meeting. In
addition, each non-employee director who is a chairman of a committee of the board receives an annual retainer of $5,000. 
 The chairman of
the board of directors of Curis, Inc. receives, as compensation for his service as a director, $10,000 per month plus a payment for his annual health insurance expense, which equaled $16,409 for the fiscal year ended December 31, 2006.
Non-employee directors are reimbursed for reasonable out-of-pocket expenses incurred in attending any board or committee meetings. 
 Directors who are employees of Curis, Inc. are not compensated for their attendance at board or committee meetings. 
 Pursuant to
the 2000 Director Stock Option Plan of Curis, Inc., each non-employee director receives options to purchase 25,000 shares of the common stock of Curis, Inc. on the date of his or her initial election to the board of directors. These option grants
vest ratably over four years on (a) the first anniversary of the date of grant and (b) the day before the annual meeting of stockholders each year thereafter. No further vesting occurs with respect to an option granted after the optionee
ceases to be a non-employee director. In addition, each non-employee director, other than a director who was initially elected to the board at any such annual meeting or, if previously, at any time after the prior year’s annual meeting,
receives options to purchase 5,000 shares of common stock on the date of each annual meeting of stockholders, provided that such director continues to serve as a director immediately after such annual meeting. The options granted annually are fully
vested on the date of grant. The exercise price of options granted under the plan equals the closing price of the common stock on the date of grant as reported on the Nasdaq Global Market, or such other nationally recognized exchange or trading
system if the common stock is no longer traded on the Nasdaq Global Market. Immediately prior to the occurrence of an acquisition event, as defined in the 2000 Director Stock Option Plan, each outstanding option granted under the plan becomes fully
vested. Options granted under the plan terminate, and may no longer be exercised, on the earlier of (i) the date ten years after the grant date of such option or (ii) the first anniversary of the date on which the optionee ceases to serve
as a director; provided, however, that in the event that a non-employee director has served as a director for at least five years, each option held by such director terminates, and may no longer be exercised, on the date ten years after the grant
date of the applicable option. 
 In addition to the above, each of the directors is eligible to receive stock options and stock awards under
the 2000 Stock Incentive Plan of Curis, Inc.Supplemental Indenture between Level 3 Communications, Inc. and Bank Of New York

 Exhibit 4.1 
  

 LEVEL 3 COMMUNICATIONS, INC., 
 as Issuer, 
 and 
 THE BANK OF NEW YORK, 
 as Trustee 
  

 Supplemental Indenture

 Dated as of March 1, 2007 
  

 11% Senior Notes Due 2008 
  

 SUPPLEMENTAL INDENTURE 
 SUPPLEMENTAL INDENTURE (this “Supplemental Indenture”), dated as of March 1, 2007, between LEVEL 3 COMMUNICATIONS, INC., a Delaware
corporation (the “Issuer”), and THE BANK OF NEW YORK, a New York banking corporation (the “Trustee”), as Trustee under the Indenture (as hereinafter defined). 
 WHEREAS, the Issuer and the Trustee have as of February 29, 2000 entered into an Indenture (the “Indenture”), providing for the issuance
by the Issuer from time to time of its 11% Senior Notes due 2008; 
 WHEREAS, Section 902 of the Indenture provides, among other things,
that the Issuer and the Trustee, with the consent of the Holders of not less than a majority in principal amount of the Outstanding Securities, may enter into one or more supplemental indentures for the purpose of adding provisions to or changing or
eliminating certain of the provisions of the Indenture; 
 WHEREAS, the Issuer has received the written consents of the Holders of a majority
of the aggregate principal amount of the Outstanding Securities to amend the Indenture as provided herein and enter into this Supplemental Indenture; 
 WHEREAS, the Issuer desires to enter into this Supplemental Indenture, and has duly authorized the execution and delivery of this Supplemental Indenture to modify the Indenture; 
 WHEREAS, concurrent with the execution hereof, the Issuer has delivered to the Trustee an Officers’ Certificate and has caused its counsel to
deliver to the Trustee an Opinion of Counsel; and 
 WHEREAS, all conditions and requirements of the Indenture necessary to make this
Supplemental Indenture a valid, binding and legal instrument in accordance with its terms have been performed and fulfilled by the parties hereto and the execution and delivery thereof have been in all respects duly authorized by the parties hereto.

 NOW, THEREFORE: 
 For and in
consideration of the mutual premises and agreements herein contained, the Issuer and the Trustee covenant and agree, for the equal and proportionate benefit of all Holders of the Securities, as follows: 
 ARTICLE I. 
 EFFECTIVENESS AND EFFECT

 Section 1.1 Effectiveness and Effect. 
 This Supplemental Indenture shall take effect on the date hereof, provided, however, that the amendments provided for in Article Two hereof shall only become operative if an aggregate principal amount of Securities
exceeding $39,028,500 is accepted by the Issuer for payment on the Initial Payment Date (as defined in that certain Offer to Purchase and Consent Solicitation Statement of the Issuer, dated February 14, 2007), and such amendments provided for
in Article Two hereof shall have no force or effect prior to the operative time specified in this Section. Subject to the foregoing, the provisions set 

 
forth in this Supplemental Indenture shall be deemed to be, and shall be construed as part of, the Indenture. All references to the Indenture in the
Indenture or in any other agreement, document or instrument delivered in connection therewith or pursuant thereto shall be deemed to refer to the Indenture as amended by this Supplemental Indenture. Except as amended hereby, the Indenture shall
remain in full force and effect. 
 ARTICLE II. 
 AMENDMENT OF THE INDENTURE 
 Section 2.1 Deletion of Definitions and Related References 
 Section 101 of the Indenture is hereby amended to delete in their entirety all terms and their respective definitions for which all references are
eliminated in the Indenture as a result of the amendments set forth in Section 2.2 of this Supplemental Indenture. 
 Section 2.2 Amendments to
Indenture. 
 The Indenture is hereby amended by deleting the following sections of the Indenture and all references thereto in the
Indenture in their entirety and replacing each such section with the term “INTENTIONALLY OMITTED”: 
 Section 1004 (Corporate
Existence); 
 Section 1005 (Maintenance of Properties); 
 Section 1006 (Insurance); 
 Section 1007 (Reports); 
 Section 1008 (Statement by Officers as to Default); 
 Section 1010 (Limitation on Consolidated Debt); 
 Section 1011 (Limitation on Debt of Restricted
Subsidiaries); 
 Section 1012 (Limitation on Restricted Payments); 
 Section 1013 (Limitation on Dividend and Other Payment Restrictions Affecting Restricted Subsidiaries); 
 Section 1014 (Limitation on Liens); 
 Section 1015 (Limitation on Sale and Leaseback Transactions); 
 Section 1016 (Limitation on Asset Dispositions);

 Section 1017 (Limitation on Issuance and Sales of Capital Stock of Restricted Subsidiaries); 
 Section 1018 (Transactions with Affiliates); 
 Section 1019 (Limitation on Designations of Unrestricted Subsidiaries); 
 Section 501(4), (6) and (7) (Events of
Default); and 
 Section 801(3) and (4) (Company May Consolidate, etc., Only on Certain Terms). 
 ARTICLE III. 
 MISCELLANEOUS

 Section 3.1 Counterparts. 
 This Supplemental Indenture may be executed in counterparts, each of which when so executed shall be deemed to be an original, but all such counterparts shall together constitute one and the same instrument. 
  

 2 

 Section 3.2 Severability. 
 In the event that any provision in this Supplemental Indenture shall be held to be invalid, illegal or unenforceable, the validity, legality and enforceability of the remaining provisions shall not in any way be
affected or impaired thereby. 
 Section 3.3 Headings. 
 The article and section headings herein are for convenience only and shall not affect the construction hereof. 
 Section 3.4 Successors and Assigns. 
 Any covenants and agreements in this Supplemental Indenture by the Issuer and the
Trustee shall bind their successors and assigns, whether so expressed or not. 
 Section 3.5 Governing Law. 
 THIS SUPPLEMENTAL INDENTURE SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK BUT WITHOUT GIVING EFFECT TO
APPLICABLE PRINCIPLES OF CONFLICTS OF LAW TO THE EXTENT THAT THE APPLICATION OF THE LAWS OF ANOTHER JURISDICTION WOULD BE REQUIRED THEREBY. 
 Section 3.6 Effect of Supplemental Indenture. 
 Except as amended by this Supplemental Indenture, the terms and
provisions of the Indenture shall remain in full force and effect. 
 Section 3.7 Trustee. 
 The Issuer hereby acknowledges and agrees to comply with its reporting obligations under the Trust Indenture Act of 1939. The Trustee assumes no
responsibility for the correctness of the recitals herein contained, which shall be taken as the statements of the Issuer, and the Trustee shall not be responsible or accountable in any way whatsoever for or with respect to the validity or execution
or sufficiency of this Supplemental Indenture, and the Trustee makes no representation with respect thereto. 
 Section 3.8 Endorsement and Change of
Form of Securities. 
 Any Securities authenticated and delivered after the close of business on the date that this Supplemental
Indenture becomes effective may be affixed to, stamped, imprinted or otherwise legended by the Trustee, with a notation as follows: 
 “Effective as of March 1, 2007, certain restrictive covenants of the Indenture and certain of the Events of Default have been eliminated, as provided in the Supplemental Indenture, dated as of March 1, 2007. Reference is
hereby made to said Supplemental Indenture, copies of which are on file with the Trustee, for a description of the amendments made therein.” 
 Section 3.9 Definitions. 
 Capitalized terms used but not defined herein shall have the respective meanings ascribed to
them in the Indenture. 
  

 3 

 IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly executed by
their respective officers hereunto duly authorized, all as of the day and year first above written. 
  

			
	LEVEL 3 COMMUNICATIONS, INC.
		
	By:	 	 /s/ Robin E. Grey

	Name:	 	Robin E. Grey
	Title:	 	Senior Vice President
	
	THE BANK OF NEW YORK, as Trustee
		
	By:	 	 /s/ Stacey B. Poindexter

	Name:	 	Stacey B. Poindexter
	Title:	 	Assistant Vice President

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