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

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 original due date therefor (with such determination being made on the basis of payment terms being substantially consistent with past practice), provided however, that receivables (up to maximum amount equal to $50,000,000) that have become more than 90 days (but less than one hundred twenty (120) days) past the original due date therefor shall be excluded in determining the percentage set forth above in this Section 10.1(p) solely to the extent, and by an amount equal to the amount by which, Unrestricted Cash and Cash Equivalents exceeds $50,000,000.