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E1A gene expression induces susceptibility to killing by NK cells following immortalization but not adenovirus infection of human cells .
 ( DNA: E1A gene, None) , ( cell type: human cells, None) , ( cell type: NK 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:
 ( DNA: E1A gene, None) , ( cell type: human cells, None) , ( cell type: NK cells, None) 