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Controversy has centered on cases of bovine spongiform encephalopathy ( BSE ; commonly known as mad cow disease ) , and the use of ractopamine as an additive in feeds .
 bovine spongiform encephalopathy
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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Text: {0} 
Answer:
 bovine spongiform encephalopathy