13469
Our investigations have focused on localizing cis-elements responsible for the down regulation of the adult beta-like globin genes ( delta and beta ) in immature , or primitive erythroid tissues .
 ( DNA: adult beta-like globin genes, None) , ( DNA: delta, None) , ( DNA: cis-elements, None) , ( DNA: beta, 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: adult beta-like globin genes, None) , ( DNA: delta, None) , ( DNA: cis-elements, None) , ( DNA: beta, None) 