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The activation of STAT nuclear factors was studied by electrophoretic mobility shift assay using a gamma activation site ( GAS ) probe .
 ( DNA: gamma activation site, None) , ( protein: STAT nuclear factors, None) , ( DNA: GAS, 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: gamma activation site, None) , ( protein: STAT nuclear factors, None) , ( DNA: GAS, None) 