SECTION #Amendments to the Receivables Purchase Agreement. Effective as of the Amendment Date, the Receivables Purchase Agreement is hereby amended as follows:

#Section 1.5 of the Purchase Agreement is hereby amended to read in its entirety as follows:

Receivables. Greater than 50% of all accounts receivable of the Credit Parties and their Subsidiaries arising from the sale of BioThrax or NuThrax to Governmental Authorities of the Federal Government of the United States under a Material Contract becomes more than ninety (90) days past the

Purchase Agreement. Each of the Parties agrees that for all purposes under the Purchase Agreement, # the term “Call Option” as used therein shall be deemed to mean the “Early Call Option” as contemplated herein, # the term “Margin Loan Financing” as used therein shall be deemed to include the debt financing contemplated by the 2021 Margin Loan Agreements, # the obligations of NEP and its affiliates pursuant to [Section 5.05(c)] of the Purchase Agreement with respect to the NEP Non-Voting Units (as defined in the Purchase Agreement) shall apply to the same extent to the NEP Common Units, and # the Issuer Agreement attached as [Exhibit E] to the Purchase Agreement shall be replaced with the form of issuer agreement attached as Exhibit C hereto.

Purchase Agreement. By its acceptance of this Note, each party agrees to be bound by the applicable terms of the Purchase Agreement.

Purchase Agreement. The Company and the Holder shall be bound by the applicable terms of the Purchase Agreement and the documents entered into in connection herewith and therewith.

amendments set forth in Clause 2 (Amendments to the Receivables Transfer Agreement) of this Amendment or the limited waiver set forth in Clause 7 (Limited Waiver).

Receivables Purchase Agreement

"Purchased Receivables" means all Receivables which are the subject to any sale and purchase (or any purported sale and purchase) pursuant to Clause 2.2 of this Agreement and any other Receivables in respect of which the Receivables Purchase Price has been paid or will be paid by the [[Organization A:Organization]] to the Seller.

Notify [[Organization B:Organization]] immediately if any of its Receivables arise out of contracts between any Loan Party and # the United States, any state, or any department, agency or instrumentality of any of them, and # Canada or any department, agency, instrumentality or crown corporation thereof.

Eligible Receivables. The definition of “Eligible Receivables” set forth in Section 1.01 of the Credit Agreement is hereby amended by # deleting “; or” at the end of [clause (q)] and replacing it with a semicolon, # deleting the period at the end of [clause (r)] and replacing it with “; or”, and # adding the following new [clause (s)] immediately [following clause (r)] therein:

Governmental Receivables. To collect all amounts due from any government agency by reason of sale of Wound Care Products (“Government Receivables”), and to receive and administer all payments from all Government Receivables in the Provider’s name and on the Provider’s behalf, and to deposit such amounts in a bank account in the Provider’s name (“Provider Lockbox Account”). The Provider Lockbox Account may be established for Provider by Manager but the account shall be the sole and exclusive property of Provider. Manager shall have no control over and shall not be authorized to make withdrawals from the Provider Lockbox Account. It shall, however, be a material breach of this Agreement by Provider to terminate the Manager’s ability to sweep the amounts received in the Provider Lockbox Account into the Operating Account as set forth in [Section 3.1.5].

Government Receivables. The account debtor is not the United States or any agency or department thereof.

Tenant Receivables. Rents due from tenants under Leases and from tenants or licensees under License Agreements and operating expenses and/or taxes payable by tenants under Leases (collectively, “Tenant Receivables”) and not collected by ​ as of Closing shall not be prorated between ​ and ​ at Closing but shall be apportioned on the basis of the period for which the same are payable and if, as and when collected, as follows:

Entire Agreement; Amendments. This Agreement supersedes, discharges and cancels all previous agreements regarding Executive’s employment with ​, including without limitation that certain Executive Agreement by and between ​ and Executive dated as of September 19, 2016, and constitutes the entire agreement between the parties with regard to the subject matter hereof. No agreements, representations, or statements of any party not contained herein shall be binding on either party. Further, no amendment or variation of the terms or conditions of this Agreement shall be valid unless in writing and signed by both parties.

Entire Agreement; Amendments. This Agreement, the other Transaction Documents and the schedules and exhibits attached hereto and thereto and the instruments referenced herein and therein supersede all other prior oral or written agreements between the Buyers, the Company, its Subsidiaries, their affiliates and Persons acting on their behalf, including, without limitation, any transactions by any Buyer with respect to Common Stock or the Securities, and the other matters contained herein and therein, and this Agreement, the other Transaction Documents, the schedules and exhibits attached hereto and thereto and the instruments referenced herein and therein contain the entire understanding of the parties solely with respect to the matters covered herein and therein; provided, however, nothing contained in this Agreement or any other Transaction Document shall (or shall be deemed to) # have any effect on any agreements any Buyer has entered into with, or any instruments any Buyer has received from, the Company or any of its Subsidiaries prior to the date hereof with respect to any prior investment made by such Buyer in the Company or # waive, alter, modify or amend in any respect any obligations of the Company or any of its Subsidiaries, or any rights of or benefits to any Buyer or any other Person, in any agreement entered into prior to the date hereof between or among the Company and/or any of its Subsidiaries and any Buyer, or any instruments any Buyer received from the Company and/or any of its Subsidiaries prior to the date hereof, and all such agreements and instruments shall continue in full force and effect. Except as specifically set forth herein or therein, neither the Company nor any Buyer makes any representation, warranty, covenant or undertaking with respect to such matters. For clarification purposes, the Recitals are part of this Agreement. No provision of this Agreement may be amended other than by an instrument in writing signed by the Company and the Required Holders (as defined below), and any amendment to any provision of this Agreement made in conformity with the provisions of this Section ‎9(e) shall be binding on all Buyers and holders of Securities, as applicable, provided that no such amendment shall be effective to the extent that it # applies to less than all of the holders of the Securities then outstanding or # imposes any obligation or liability on any Buyer without such Buyer’s prior written consent (which may be granted or withheld in such Buyer’s sole discretion). No waiver shall be effective unless it is in writing and signed by an authorized representative of the waiving party, provided that the Required Holders may waive any provision of this Agreement, and any waiver of any provision of this Agreement made in conformity with the provisions of this Section ‎9(e) shall be binding on all Buyers and holders of Securities, as applicable, provided that no such waiver shall be effective to the extent that it # applies to less than all of the holders of the Securities then outstanding (unless a party gives a waiver as to itself only) or # imposes any obligation or liability on any Buyer without such Buyer’s prior written consent (which may be granted or withheld in such Buyer’s sole discretion). No consideration (other than reimbursement of legal fees) shall be offered or paid to any Person to amend or consent to a waiver or modification of any provision of any of the Transaction Documents unless the same consideration also is offered to all of the parties to the Transaction Documents or all holders of the Common Shares (as the case may be). The Company has not, directly or indirectly, made any agreements with any Buyers relating to the terms or conditions of the transactions contemplated by the Transaction Documents except as set forth in the Transaction Documents. Without limiting the foregoing, the Company confirms that, except as set forth in this Agreement, no Buyer has made any commitment or promise or has any other obligation to provide any financing to the Company, any Subsidiary or otherwise. As a material inducement for each Buyer to enter into this Agreement, the Company expressly acknowledges and agrees that # no due diligence or other investigation or inquiry conducted by a Buyer, any of its advisors or any of its representatives shall affect such Buyer’s right to rely on, or shall modify or qualify in any manner or be an exception to any of, the Company’s representations and warranties contained in this Agreement or any other Transaction Document and # unless a provision of this Agreement or any other Transaction Document is expressly preceded by the phrase “except as disclosed in the SEC Documents,” nothing contained in any of the SEC Documents shall affect such Buyer’s right to rely on, or shall modify or qualify in any manner or be an exception to any of, the Company’s representations and warranties contained in this Agreement or any other Transaction Document. “Required Holders” means Buyers entitled to purchase, in the aggregate, at least a majority of the number of Common Shares at the Closing.