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Systematic evaluation of 640 FDA - approved drugs revealed that 70 drugs increased the number of Treg cells with suppression function only in the presence of TGF beta , 75 drugs increased Treg numbers even in the absence of TGF beta , and 32 drugs increased Treg numbers synergistically with TGF beta .
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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:
 None