9736
Furthermore, the functional domains responsible for DNA binding , transactivation , and negative regulation , previously characterized in a fibroblast context , were found to have similar activity in B cells .
 ( protein: functional domains, None) , ( cell type: B cells, 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: functional domains, None) , ( cell type: B cells, None) 