13644
Previous studies have shown constitutive activation of IL-4 and IL-7 signaling pathways , as measured by activation of Janus protein kinase (JAK)1 , JAK3 , STAT5 , and STAT6 , in pre-B cells transformed by v-Abl .
 ( protein: JAK3, None) , ( protein: Janus protein kinase (JAK)1, None) , ( protein: IL-7, None) , ( cell type: pre-B cells, None) , ( protein: v-Abl, None) , ( protein: STAT5, None) , ( protein: STAT6, None) , ( protein: IL-4, 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: JAK3, None) , ( protein: Janus protein kinase (JAK)1, None) , ( protein: IL-7, None) , ( cell type: pre-B cells, None) , ( protein: v-Abl, None) , ( protein: STAT5, None) , ( protein: STAT6, None) , ( protein: IL-4, None) 