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We examined alpha A1 (an alpha A -gene product ) and alpha B1 and alpha B2 (two alpha B -encoded isomers ) for their effects on the GM-CSF promoter .
 ( protein: alpha B1, None) , ( DNA: alpha A, None) , ( protein: alpha B, None) , ( protein: alpha B2, None) , ( DNA: GM-CSF promoter, None) , ( protein: alpha A1, None) , ( protein: alpha A -gene product, None) , ( protein: alpha B -encoded isomers, 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: alpha B1, None) , ( DNA: alpha A, None) , ( protein: alpha B, None) , ( protein: alpha B2, None) , ( DNA: GM-CSF promoter, None) , ( protein: alpha A1, None) , ( protein: alpha A -gene product, None) , ( protein: alpha B -encoded isomers, None) 