Exhibit 10.8.4**FORM OF LANDLORD’S LIEN SUBORDINATION AGREEMENT**     This Agreement (“Agreement”) is made as of the 9 day of JULY, 2007, by and between**SAUL HOLDINGS LIMITED PARTNERSHIP,**a Maryland limited partnership (hereinafter called “Landlord”),and **MERRILL LYNCH BUSINESS FINANCIAL SERVICES INC.,**a Delaware corporation (hereinafter called“Secured Party”).     **WHEREAS,**Landlord is the owner and landlord of premises situate at Avenel Business Park,Phase IV Building located at 215 Perry Parkway, Gaithersburg, Maryland (the “Premises”) moreparticularly described in the Lease hereinafter mentioned; and     **WHEREAS,**Landlord has leased said Premises to SeraCare Life Sciences, Inc., a Delawarecorporation (hereinafter called “Tenant”) under the terms and conditions of the lease dated May16, 1997 (as amended, hereinafter called the “Lease”);     **WHEREAS,**Tenant has entered into an Agreement by which it granted to Secured Party a securityinterest in (i) Tenant’s inventory and accounts receivable (as those terms are defined in theUniform Commercial Code), and (ii) trade fixtures and equipment used in the operation of Tenantsbusiness in the Premises, all of which items are listed on Exhibit “A”, attached hereto and made apart hereof, but expressly excluding any fixtures or equipment permanently attached to thePremises, (the property described in clauses (i) and (ii) are hereinafter collectively called“Collateral”) in order to secure loans made and to be made by Secured Party to Tenant;     **WHEREAS,**the loans made and to be made by Secured Party are and will be beneficial to Tenant,and permit and will permit Tenant better to continue its operations as heretofore and to pay therent under the Lease; and     **WHEREAS,**Secured Party requires assurance that Landlord’s interest in the Collateral will besubordinate to the interest of Secured Party in the Collateral, and that its security interests inthe Collateral shall be paramount to any rights with respect thereto, or interest therein, whichLandlord or any subsequent owner of said real estate may have as owner, landlord or otherwise;     **NOW, THEREFORE,**Landlord agrees as follows:1. Landlord’s interest, estate and/or lien in the Collateral is hereby made subordinate to thelien, interest and estate of Secured Party therein; provided, however, that, notwithstanding anything herein contained or anydecision of any court to the contrary, the term “Collateral” shall not include any air-conditioning, heating, lighting,electrical and plumbing equipment installed in the Premises, nor any wiring or other apparatus related thereto. Furthermore,Landlord waives any interest in Tenant’s inventory and accounts receivable and agrees not to distrain or levy upon any inventory oraccounts receivable or to assess any landlord lien, right of distraint or other claim against the inventory and accountsreceivable and agrees not to distrain or levy upon any inventory or accounts receivable or to assess any landlord lien, right ifdistraint or other claim against the inventory or accounts receivable until such time as the obligations of Tenant to Lender arepaid in full or Lender waives its rights to such inventory and accounts receivable.2. Secured Party may enter the Premises to remove the Collateral, or any part thereof, in theexercise of its rights as Secured Party, under and subject to the following terms and conditions:     (a) Removal of the Collateral by Secured Party shall take place prior to the expiration of theLease or, in the event as a result of Tenant’s default (i) the Lease is terminated or (ii) Landlord elects toreenter the Premises without terminating the Lease, within fifteen (15) days after Secured Party receives a copy ofLandlord’s notice that it has elected to terminate the Lease or reenter the Premises; provided, however, that Secured Party may extendsuch fifteen (15) day period for an additional period of up to seventy-five (75) days (the “Additional Period”) afterreceipt of Landlord’s notice, if within ten (10) days after receipt of Landlord’s notice, Secured Party notifies Landlord in writing ofthe length of the Additional Period (up to the seventy-five (75) day maximum). Secured Party shall transmit to Landlord an amountequal to the then applicable sum of Base Rent, Annual Operating Costs, Additional Rent, or any other amounts due under theterms of the Lease for the Additional Period on a per diem basis, pro-rated based on a thirty (30) day month until theend of the Additional Period. Any of the Collateral remaining in the Premises after the expiration of such period(s), exceptinventory or accounts receivable, may, at Landlord’s option exercised in accordance with the Lease and applicable laws, becomethe property of Landlord, or disposed of in accordance with the terms of the Lease, free of any claims of Secured Party.The foregoing provisions granting Secured Party an additional period of time to remove the Collateral and to preserve its rightsunder this Agreement may apply in the event that Tenant becomes a debtor under the Bankruptcy Code or any similar federal orstate bankruptcy or insolvency statute if Secured Party is not permitted to remove the Collateral as a result of any stay ofactions against the Tenant arising as a result of any such bankruptcy of the Tenant, be extended by Secured Party, as providedabove, for an additional period (a “Bankruptcy Extension”). Landlord may elect to terminate the Secured Party’s rightshereunder if the Secured Party fails to exercise its right to extend for an Additional Period or a Bankruptcy Extension, asapplicable, or to transmit the amounts required above, notwithstanding the fact that Landlord is not legally permitted to proceedagainst the Tenant, it being the intention of the parties that Secured Party shall not be permitted to store the Collateral inthe Premises after the above described fifteen (15) day period unless the per diem Base Rent and other charges due underthe Lease are paid as and when due or Secured Party otherwise cures the default of the Tenant (although Secured Partyshall have no obligation to cure the default) under the Lease within fifteen (15) days following receipt of Landlord’s noticeof election to terminate the Lease. Any inventory remaining in the Premises after the expiration of an Additional Period or aBankruptcy Extension, as applicable, may be disposed of in accordance with applicable laws relating to abandoned property.     (b) Secured Party shall repair all damage to the Premises caused by the removal of theCollateral within the time period(s) specified in the foregoing subparagraph (a).     (c) if Landlord is required to engage counsel to collect amounts due from Secured Party withrespect to the Additional Period or otherwise enforce Secured Party’s obligations hereunder, Secured Partyshall pay to Landlord the reasonable costs and expenses, including attorney fees, incurred by Landlord in enforcingSecured Party’s obligations under this Agreement.
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     (d) Secured Party represents and warrants to Landlord that Secured Party has the right andauthority to enter the Premises and remove the Collateral, and will indemnify, hold harmless and defend Landlordfrom any claims by Tenant that Landlord should not allow Secured Party access to the Premises.     (e) No action by Secured Party pursuant to this Agreement shall constitute or be deemed to bean assumption by Secured Party of any obligation under the Lease, and, except as provided herein, SecuredParty shall not have any obligation to Landlord,3. Landlord waives any rights of distraint, levy or execution against the Collateral or any claimto the Collateral so long as Secured Party has a security interest in the Collateral, as provided under the terms of thisAgreement.4. Landlord will notify Secured Party of the termination of the Lease for any reason and/or ofLandlord’s election to reenter the Premises; provided, however, that any failure by Landlord to notify Secured Party ofsuch termination or reentry shall not affect or invalidate any such notice of termination of the Lease or election to reentergiven to Tenant, and such notice to Tenant shall be effective notwithstanding Secured Party’s lack of notice. Secured Party shallhave the right to cure a default of Tenant under the Lease within the fifteen (15) day notice and cure period provided for inparagraph 2 a above.5. The subordination of Landlord’s lien set forth herein shall run to the benefit of Secured Partyonly, and neither Tenant or any other person shall be entitled to rely on this agreement. This waiver shall be bindingupon the successors and transferees of Landlord.6. All notices required or desired to be given hereunder by either party to the other shall be sentby either (i) certified mail, return receipt requested, or (ii) a receipted commercial messenger service (such as FederalExpress or Airborne Express) for delivery on the next following business day. Notices to the respective parties shallbe addressed and sent as follows:**If to Landlord:**Saul Holdings Limited Partnership c/o Saul Centers, Inc.