(a) This part implements section 573 of the Federal Food, Drug, and Cosmetic Act (the act) ( 21 U.S.C. 360ccc-2 ) and contains the following subparts:(1) Subpart A-General Provisions.(2) Subpart B-Designation of a Minor Use or Minor Species New Animal Drug.(b) References in this part to regulatory sections of the Code of Federal Regulations are to Chapter I of Title 21, unless otherwise noted.