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Elf-1 is a lymphoid-specific Ets transcription factor that regulates inducible gene expression during T cell activation .
 Elf-1, T cell, lymphoid-specific Ets 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:
 Elf-1, T cell, lymphoid-specific Ets transcription factor