1687
Thereby an alternative type of La mRNA was identified that differed from the known La mRNA due to an exchange of the exon 1 .
 ( DNA: exon 1, None) , ( RNA: La mRNA, None) , ( RNA: La mRNA, 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: exon 1, None) , ( RNA: La mRNA, None) , ( RNA: La mRNA, None) 