11639
Taken together these results demonstrate that the IK protein plays a key role in the constitutive expression of MHC class II antigens and that inhibition induced by IK is upstream of CIITA in this regulatory pathway .
 ( protein: MHC class II antigens, None) , ( DNA: CIITA, None) , ( protein: IK, None) , ( protein: IK, None) , ( protein: IK protein, 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: MHC class II antigens, None) , ( DNA: CIITA, None) , ( protein: IK, None) , ( protein: IK, None) , ( protein: IK protein, None) 