660
These studies suggest that the divergent X2-box of the class II major histocompatibility complex promoters plays an important role in influencing differential expression of the human class II isotypes .
 ( DNA: human class II isotypes, None) , ( DNA: class II major histocompatibility complex promoters, None) , ( DNA: divergent X2-box, None) , ( protein: class II major histocompatibility complex, 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:
 ( DNA: human class II isotypes, None) , ( DNA: class II major histocompatibility complex promoters, None) , ( DNA: divergent X2-box, None) , ( protein: class II major histocompatibility complex, None) 