1022
A new protein-DNA interaction has been identified upstream of the intron enhancer , within the matrix-associated region of the J-C intron .
 ( DNA: J-C intron, None) , ( DNA: matrix-associated region, None) , ( DNA: intron enhancer, 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: J-C intron, None) , ( DNA: matrix-associated region, None) , ( DNA: intron enhancer, None) 