15001
Suppression of a cellular differentiation program by phorbol esters coincides with inhibition of binding of a cell-specific transcription factor ( NF-E2 ) to an enhancer element required for expression of an erythroid-specific gene .
 NF-E2, erythroid-specific gene, enhancer element, cell-specific transcription factor
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:
 NF-E2, erythroid-specific gene, enhancer element, cell-specific transcription factor