656
Substitution promoters were then generated where the entire X-box , or only the X1- or X2- boxes of HLA-DRA were replaced with the analogous regions of HLA-DQB .
 ( DNA: HLA-DQB, None) , ( DNA: HLA-DRA, None) , ( DNA: X-box, 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: HLA-DQB, None) , ( DNA: HLA-DRA, None) , ( DNA: X-box, None) 