1451
Using a genetic screen in yeast, we have isolated B cell-derived cDNAs encoding Oct-binding factor 1 ( OBF-1 ), a novel protein that specifically associates with Oct-1 and Oct-2 .
 ( protein: Oct-1, None) , ( protein: Oct-2, None) , ( DNA: B cell-derived cDNAs, None) , ( protein: OBF-1, None) , ( protein: Oct-binding factor 1, 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: Oct-1, None) , ( protein: Oct-2, None) , ( DNA: B cell-derived cDNAs, None) , ( protein: OBF-1, None) , ( protein: Oct-binding factor 1, None) 