2703
Mutation of these elements indicated that two, MS-2beta and MS-2gamma , are critical to the induction of the CD11b gene during differentiation of the pro-monocytic cell line U937 .
 ( protein: CD11b, None) , ( protein: MS-2gamma, None) , ( DNA: CD11b gene, None) , ( cell line: pro-monocytic cell line U937, None) , ( protein: MS-2beta, 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: CD11b, None) , ( protein: MS-2gamma, None) , ( DNA: CD11b gene, None) , ( cell line: pro-monocytic cell line U937, None) , ( protein: MS-2beta, None) 