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These experiments show the presence of a strong positive-acting element , located between -417 and -207 bp 5' to the zeta-globin mRNA cap site , is necessary for high-level promoter activity in K562 cells .
 ( DNA: positive-acting element, None) , ( DNA: -417 and -207 bp 5#$%#, None) , ( RNA: zeta-globin mRNA, None) , ( DNA: zeta-globin mRNA cap site, None) , ( protein: zeta-globin, None) , ( cell line: K562 cells, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( DNA: positive-acting element, None) , ( DNA: -417 and -207 bp 5#$%#, None) , ( RNA: zeta-globin mRNA, None) , ( DNA: zeta-globin mRNA cap site, None) , ( protein: zeta-globin, None) , ( cell line: K562 cells, None) 