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PU.1/Pip and basic helix loop helix zipper transcription factors interact with binding sites in the CD20 promoter to help confer lineage- and stage-specific expression of CD20 in B lymphocytes .
 basic helix loop helix zipper transcription factors, CD20 promoter, PU.1/Pip, CD20, binding sites, B lymphocytes, transcription factors
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 zipper transcription factors, CD20 promoter, PU.1/Pip, CD20, binding sites, B lymphocytes, transcription factors