3761
Various modes of basic helix-loop-helix protein -mediated regulation of murine leukemia virus transcription in lymphoid cell lines .
 basic helix-loop-helix protein, lymphoid cell lines
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 basic helix-loop-helix protein, lymphoid cell lines