5218
The class II transactivator ( CIITA ) and B cell octamer-binding protein 1/octamer-binding factor 1/Oct coactivator from B cells ( Bob1/OBF-1/OCA-B ) represent two B cell-specific transcriptional coactivators .
 ( protein: CIITA, None) , ( cell type: B cells, None) , ( protein: B cell octamer-binding protein 1/octamer-binding factor 1/Oct coactivator, None) , ( protein: class II transactivator, None) , ( protein: B cell-specific transcriptional coactivators, None) , ( protein: Bob1/OBF-1/OCA-B, 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: CIITA, None) , ( cell type: B cells, None) , ( protein: B cell octamer-binding protein 1/octamer-binding factor 1/Oct coactivator, None) , ( protein: class II transactivator, None) , ( protein: B cell-specific transcriptional coactivators, None) , ( protein: Bob1/OBF-1/OCA-B, None) 