658
Moreover, replacement of the DQB X2-box with the DRA X2-box markedly diminished the activity of the DQB promoter in the mutant cell .
 ( cell line: mutant cell, None) , ( DNA: DRA X2-box, None) , ( DNA: DQB X2-box, None) , ( DNA: DQB promoter, 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 line: mutant cell, None) , ( DNA: DRA X2-box, None) , ( DNA: DQB X2-box, None) , ( DNA: DQB promoter, None) 