CFR›Title 1›Chapter I›Part 21›Subpart A›Subject Group Amendments ContainsSection 21.20CorpusDaily eCFRDisplayed edition2026-04-15Last updated2026-04-15 Sections 21.20 § 21.20 General requirements. Previous 21.6 § 21.6 Notice of expiration of codified material. Next Code Structure Code Structure