CFR › Title 21 › Part 660 › §660.3121 CFR §660.31Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy linkDonors of peripheral blood for Reagent Red Blood Cells must meet all the criteria for donor eligibility under §§ 630.10 and 630.15 of this chapter.