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We conclude that although cell cycle arrest induced by alpha-IFN may be mediated in part by formation of a complex containing p130 and E2F-4 , alpha-IFN does not induce hyperphosphorylation of E2F-4 , which characterizes primary hemopoietic cells in G0 .
 ( protein: p130, None) , ( protein: E2F-4, None) , ( protein: E2F-4, None) , ( cell type: primary hemopoietic cells, None) , ( protein: alpha-IFN, None) , ( protein: alpha-IFN, 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: p130, None) , ( protein: E2F-4, None) , ( protein: E2F-4, None) , ( cell type: primary hemopoietic cells, None) , ( protein: alpha-IFN, None) , ( protein: alpha-IFN, None) 