14713
The X box region is critical for directing the expression of class II major histocompatibility complex genes in B lymphocytes .
 ( cell type: B lymphocytes, None) , ( DNA: X box region, None) , ( DNA: class II major histocompatibility complex genes, 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 type: B lymphocytes, None) , ( DNA: X box region, None) , ( DNA: class II major histocompatibility complex genes, None) 