14849
Selectivity against the four individual JAK family enzymes , JAK1 , 2 , 3 and TYK2 , is now a key goal since they each play subtly different roles in cytokine - induced cell signaling .
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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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