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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 .
 p130, E2F-4, E2F-4, primary hemopoietic cells, alpha-IFN, alpha-IFN
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 p130, E2F-4, E2F-4, primary hemopoietic cells, alpha-IFN, alpha-IFN