4115
Coactivator OCA-B may undergo a POU-dependent conformational change that exposes its amino terminus, allowing it to recognize specific DNA sequences in the major groove within the binding site for Oct-1 or Oct-2 .
 ( protein: OCA-B, None) , ( DNA: DNA sequences, None) , ( protein: Oct-1, None) , ( DNA: major groove, None) , ( protein: Oct-2, 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:
 ( protein: OCA-B, None) , ( DNA: DNA sequences, None) , ( protein: Oct-1, None) , ( DNA: major groove, None) , ( protein: Oct-2, None) 