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Transcriptional regulation of the human alpha-like globin genes , embryonic zeta 2 and adult alpha , during erythroid development is mediated by a distal enhancer , HS-40 .
 ( DNA: distal enhancer, None) , ( DNA: HS-40, None) , ( DNA: human alpha-like globin genes, None) , ( DNA: adult alpha, None) , ( DNA: embryonic zeta 2, 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: distal enhancer, None) , ( DNA: HS-40, None) , ( DNA: human alpha-like globin genes, None) , ( DNA: adult alpha, None) , ( DNA: embryonic zeta 2, None) 