14692
Site-directed mutagenesis demonstrated that this HS-40 enhancer- zeta 2 globin promoter interaction is mediated by the two GATA-1 factor binding motifs located at -230 and -104, respectively.
 ( DNA: HS-40, None) , ( DNA: zeta 2 globin promoter, None) , ( DNA: GATA-1 factor binding motifs, 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: HS-40, None) , ( DNA: zeta 2 globin promoter, None) , ( DNA: GATA-1 factor binding motifs, None) 