1369
Characterization of the CD48 gene demonstrates a positive element that is specific to Epstein-Barr virus -immortalized B-cell lines and contains an essential NF-kappa B site .
 ( cell type: Epstein-Barr virus -immortalized B-cell lines, None) , ( protein: NF-kappa B, None) , ( DNA: NF-kappa B site, None) , ( DNA: CD48 gene, 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:
 ( cell type: Epstein-Barr virus -immortalized B-cell lines, None) , ( protein: NF-kappa B, None) , ( DNA: NF-kappa B site, None) , ( DNA: CD48 gene, None) 