11347
BSAP is unique among the transcription factors that regulate epsilon germline expression , because it is B cell specific, and is at the merging point of two signalling pathways that are critical for IgE switching .
 BSAP, germline, transcription factors, IgE
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:
 BSAP, germline, transcription factors, IgE