1934
Activation of the enhancer in non- B cells upon overexpression of the basic helix-loop-helix (bHLH) protein E2A appears to be mediated not only by the binding of E2A to its cognate E box but also by the resulting displacement of a repressor from that same site.
 non- B cells, repressor, E2A, E2A, B cells, E box, basic helix-loop-helix (bHLH) protein, enhancer
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:
 non- B cells, repressor, E2A, E2A, B cells, E box, basic helix-loop-helix (bHLH) protein, enhancer