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RB -defective tumor lines are non-inducible for MHC class II by IFN-gamma , or very weakly inducible, but transfection of 2 different lines with RB expression vectors re-establishes or substantially enhances class II inducibility .
 ( DNA: RB expression vectors, None) , ( protein: RB, None) , ( protein: IFN-gamma, None) , ( cell line: RB -defective tumor lines, None) , ( protein: RB, None) , ( protein: MHC class II, 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:
 ( DNA: RB expression vectors, None) , ( protein: RB, None) , ( protein: IFN-gamma, None) , ( cell line: RB -defective tumor lines, None) , ( protein: RB, None) , ( protein: MHC class II, None) 