404
The erythroid differentiation of HEL cells was inhibited by recombinant human nm23 -H1 , -H2 , mouse nm23 -M1 , and -M2 proteins .
 ( cell line: HEL cells, 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: HEL cells, None) 