1371
Here, we report on the identification of an enhancer element in the CD48 gene which reproducibly confers strong transcriptional activity only in EBV -positive B-lymphoblastoid cell lines .
 ( DNA: enhancer element, None) , ( DNA: CD48 gene, None) , ( protein: CD48, None) , ( cell line: EBV -positive B-lymphoblastoid cell lines, 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: enhancer element, None) , ( DNA: CD48 gene, None) , ( protein: CD48, None) , ( cell line: EBV -positive B-lymphoblastoid cell lines, None) 