11636
Here, we demonstrate a novel role for IK in MHC class II expression since over-expression of this protein by stable transfection into human B cells led to a total disappearance of constitutive MHC class II mRNA expression .
 ( protein: MHC class II, None) , ( RNA: MHC class II mRNA, None) , ( protein: IK, 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, None) , ( RNA: MHC class II mRNA, None) , ( protein: IK, None) 