13864
We found that erythropoietin induces tyrosine phosphorylation of Jak2 , STAT5A , and STAT5B .
 STAT5B, erythropoietin, STAT5A, Jak2
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:
 STAT5B, erythropoietin, STAT5A, Jak2