| http://www.w3.org/ns/prov#value | - The regulations under 21 CFR part 1271, subpart C set out requirements for determining donor-eligibility, including donor screening and testing, for donors of human cells, tissues, and cellular and tissue-based products (HCT/Ps).This guidance applies to cells and tissues procured on or after the effective date of the regulations contained in 21 CFR part 1271, subpart C (effective date May 25, 2005
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