1020
An AP1 binding site upstream of the kappa immunoglobulin intron enhancer binds inducible factors and contributes to expression.
 ( DNA: AP1 binding site, None) , ( protein: inducible factors, None) , ( DNA: kappa immunoglobulin 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: AP1 binding site, None) , ( protein: inducible factors, None) , ( DNA: kappa immunoglobulin intron enhancer, None) 