12614
Upon ligand-induced Mpl homodimerization , the major signaling events for proliferation are mediated through the JAK2 /STAT5 pathway , while differentiation might occur through a prolonged activation of the MAPK pathway .
 ( protein: MAPK, None) , ( protein: JAK2, None) , ( protein: /STAT5, 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: MAPK, None) , ( protein: JAK2, None) , ( protein: /STAT5, None) 