823
This protein, previously identified by its binding to the Ig kappa 3' enhancer and the Ig heavy chain mu E1 site , thus also appears to be quite important in the regulation of MHC class II gene expression .
 ( DNA: Ig heavy chain mu E1 site, None) , ( DNA: MHC class II gene, None) , ( DNA: Ig kappa 3#$%# enhancer, None) , ( protein: Ig heavy chain, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( DNA: Ig heavy chain mu E1 site, None) , ( DNA: MHC class II gene, None) , ( DNA: Ig kappa 3#$%# enhancer, None) , ( protein: Ig heavy chain, None) 