24821
Among the cytokines studied IL - 8 , IL - 6 , TNF alpha , IL - 10 , TGF beta and IL - 13 , the expression frequency of IL - 13 increased in RG - SS .
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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