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We investigated whether BSAP plays a role in the transcriptional regulation of the epsilon germline promoter in human B cells .
 human B cells, germline promoter, BSAP
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:
 human B cells, germline promoter, BSAP