CFR › Title 21 › Part 600 › §600.1521 CFR §600.15Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy linkThe following products shall be maintained during shipment at the specified temperatures:(a)Products.(b)Exemptions. Exemptions or modifications shall be made only upon written approval, in the form of a supplement to the biologics license application, approved by the Director, Center for Biologics Evaluation and Research.