8768
To characterize the human elk-1 promoter , we mapped the transcriptional start site and isolated elk-1 -specific genomic phage clones that contained extensive upstream and downstream sequences .
 ( DNA: human elk-1 promoter, None) , ( cell line: elk-1 -specific genomic phage clones, None) , ( DNA: elk-1, None) , ( DNA: elk-1, None) , ( DNA: transcriptional start site, 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: human elk-1 promoter, None) , ( cell line: elk-1 -specific genomic phage clones, None) , ( DNA: elk-1, None) , ( DNA: elk-1, None) , ( DNA: transcriptional start site, None) 