1689
In addition, the presence of an alternative promoter site , which exists within the intron downstream of the exon 1 , became evident.
 ( DNA: intron, None) , ( DNA: alternative promoter site, None) , ( DNA: exon 1, 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: intron, None) , ( DNA: alternative promoter site, None) , ( DNA: exon 1, None) 