CFR›Title 21›Chapter I›Part 320›Subpart A ContainsSection 320.1CorpusDaily eCFRDisplayed edition2026-06-03Last updated2026-06-03 Subpart A—General Provisions Sections 320.1 § 320.1 Definitions. Next B Subpart B—Procedures for Determining the Bioavailability or Bioequivalence of Drug Products