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In contrast, neither E(gre) nor EA/S motifs contributed pronouncedly to Akv MLV transcription in NIH 3T3 cells lacking DNA-binding ALF1 or HEB and E2A proteins .
 E2A proteins, ALF1, HEB, E(gre), EA/S, EA/S motifs, NIH 3T3 cells
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:
 E2A proteins, ALF1, HEB, E(gre), EA/S, EA/S motifs, NIH 3T3 cells