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We recently identified a differentiation inhibitory factor ( I-factor ) in mouse myeloid leukemia M1 cells as a murine homolog of the human nm23-H2 gene product .
 ( cell line: mouse myeloid leukemia M1 cells, None) , ( protein: human nm23-H2 gene product, None) , ( protein: murine homolog, None) , ( protein: I-factor, None) , ( protein: differentiation inhibitory factor, 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 line: mouse myeloid leukemia M1 cells, None) , ( protein: human nm23-H2 gene product, None) , ( protein: murine homolog, None) , ( protein: I-factor, None) , ( protein: differentiation inhibitory factor, None) 