{"data":{"id":"us/21-cfr-556.240","jurisdiction":"us","citation":"21 CFR 556.240","heading":"Estradiol and related esters.","body":"(a) [Reserved]\n(b) Residues. Residues of estradiol are not permitted in excess of the following increments above the concentrations of estradiol naturally present in untreated animals:\n(1) Cattle. (i) Muscle: 0.2 ppb.\n(ii) Liver: 0.6 ppb.\n(iii) Kidney: 1.2 ppb.\n(iv) Fat: 1.2 ppb.\n(2) [Reserved]\n(c) Related conditions of use. See §§ 522.840, 522.850, 522.1940, 522.2343, 522.2477, and 522.2478 of this chapter.","path":["Title 21—Food and Drugs","CHAPTER I—FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES","SUBCHAPTER E—ANIMAL DRUGS, FEEDS, AND RELATED PRODUCTS","PART 556—TOLERANCES FOR RESIDUES OF NEW ANIMAL DRUGS IN FOOD","Subpart B—Specific Tolerances for Residues of Approved and Conditionally Approved New Animal Drugs"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-21.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:24:47Z","sha256":"c30d631ff3b15bd76b4e14a280c9b9aec7549d4045d622b63a55c8c4873fce15","source_id":"us-cfr","stale":true,"prev":"us/21-cfr-556.230","next":"us/21-cfr-556.260"},"notice":"GroundRules: Original legal text. Not legal advice."}