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U.S. Code of Federal Regula...
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Title 21-Food and Drugs
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CHAPTER I—FOOD AND DRUG ADM...
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PART 589—SUBSTANCES PROHIBITED FROM USE IN ANIM...
PART 589—SUBSTANCES PROHIBITED FROM USE IN ANIMAL FOOD OR FEED
§ 589.1 - Substances prohibited from use in animal food or feed.
§ 589.1000 - Gentian violet.
§ 589.1001 - Propylene glycol in or on cat food.
§ 589.2000 - Animal proteins prohibited in ruminant feed.
§ 589.2001 - Cattle materials prohibited in animal food or feed to prevent the transmission of bovine spongiform encephalopathy.