13532
These results therefore demonstrate that the MHC class II gene silencing in somatic cell hybrids is due to an active suppression of one of the promoters of the CIITA gene , mediated by the epithelial cell fusion partner .
 ( DNA: CIITA gene, None) , ( DNA: promoters, None) , ( cell type: epithelial cell fusion partner, None) , ( cell line: somatic cell hybrids, None) , ( protein: CIITA, 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: CIITA gene, None) , ( DNA: promoters, None) , ( cell type: epithelial cell fusion partner, None) , ( cell line: somatic cell hybrids, None) , ( protein: CIITA, None) , ( protein: MHC class II, None) 