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The E2A gene encodes transcription factors of the helix-loop-helix family that are implicated in cell-specific gene expression as part of dimeric complexes that interact with E box enhancer elements .
 dimeric complexes, helix-loop-helix family, transcription factors, E box, E box enhancer elements, E2A gene
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:
 dimeric complexes, helix-loop-helix family, transcription factors, E box, E box enhancer elements, E2A gene