8708
These transcription factors are either not produced due to block of transcription of their respective genes ( Oct-2 , OBF-1 , PU.1 ), or are rendered inactive posttranslationally ( NF-kappa B , E47 ).
 OBF-1, E47, transcription factors, PU.1, NF-kappa B, Oct-2
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:
 OBF-1, E47, transcription factors, PU.1, NF-kappa B, Oct-2