4486
Recent studies have identified homologues of STAT5 , STAT5A , and STAT5B , as well as lower molecular weight variants of STAT5 .
 ( protein: STAT5B, None) , ( protein: STAT5, None) , ( protein: STAT5, None) , ( protein: STAT5A, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( protein: STAT5B, None) , ( protein: STAT5, None) , ( protein: STAT5, None) , ( protein: STAT5A, None) 