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Since 1998 , nine different biologics have been approved by the US Food and Drug Administration ( FDA ) and European Medicines Agency ( EMA ) for the treatment of RA , and several others are in different stages of clinical trials .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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