3303
Susceptibility to natural killer cells and down regulation of MHC class I expression in adenovirus 12 transformed cells are regulated by different E1A domains .
 ( cell line: adenovirus 12 transformed cells, None) , ( DNA: E1A domains, None) , ( protein: MHC, None) , ( cell type: natural killer cells, 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: adenovirus 12 transformed cells, None) , ( DNA: E1A domains, None) , ( protein: MHC, None) , ( cell type: natural killer cells, None) 