7775
We show here that expression of CIITA in MHC class II -cells triggers occupation of the promoters by these complexes.
 ( cell line: MHC class II -cells, None) , ( protein: CIITA, None) , ( cell type: 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:
 ( cell line: MHC class II -cells, None) , ( protein: CIITA, None) , ( cell type: MHC class II, None) 