3761
Various modes of basic helix-loop-helix protein -mediated regulation of murine leukemia virus transcription in lymphoid cell lines .
 ( protein: basic helix-loop-helix protein, None) , ( cell line: lymphoid 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:
 ( protein: basic helix-loop-helix protein, None) , ( cell line: lymphoid cell lines, None) 