8923
IFN-alpha enhanced tyrosine phosphorylation of STAT1, STAT3 , STAT4 , STAT5a , and STAT5b .
 STAT4, STAT3, IFN-alpha, STAT5a, STAT5b
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 STAT4, STAT3, IFN-alpha, STAT5a, STAT5b