2801
Previous analyses of immunoglobulin V region promoters has led to the discovery of a common octamer motif which is functionally important in the tissue-specific and developmentally regulated transcriptional activation of immunoglobulin genes .
 ( DNA: immunoglobulin genes, None) , ( DNA: octamer motif, None) , ( DNA: immunoglobulin V region promoters, 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: immunoglobulin genes, None) , ( DNA: octamer motif, None) , ( DNA: immunoglobulin V region promoters, None) 