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 .
 CD11b, MS-2gamma, CD11b gene, pro-monocytic cell line U937, MS-2beta
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:
 CD11b, MS-2gamma, CD11b gene, pro-monocytic cell line U937, MS-2beta