13421
p130 , p107 , and pRb are differentially regulated in proliferating cells and during cell cycle arrest by alpha-interferon .
 ( cell type: proliferating cells, None) , ( protein: pRb, None) , ( protein: p107, None) , ( protein: p130, None) , ( protein: alpha-interferon, 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:
 ( cell type: proliferating cells, None) , ( protein: pRb, None) , ( protein: p107, None) , ( protein: p130, None) , ( protein: alpha-interferon, None) 