4641
These results suggest that both common mechanisms, such as the one mediated by the CIITA trans-activator , and distinct tissue-specific constraints contribute to the transcriptional control of constitutive and IFN-gamma -induced MHC class II gene expression .
 ( protein: CIITA trans-activator, None) , ( DNA: MHC class II gene, None) , ( protein: IFN-gamma, None) , ( protein: CIITA, 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 trans-activator, None) , ( DNA: MHC class II gene, None) , ( protein: IFN-gamma, None) , ( protein: CIITA, None) 