8707
We show that the molecular mechanism (s) underlying Ig gene extinction can be explained, at least in part, by a lack of transcription factors that are essential for Ig gene transcription .
 Ig gene, Ig gene, 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:
 Ig gene, Ig gene, transcription factors