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The close homology of the basic region/leucine zipper ( bZIP ) DNA-binding and dimerization domain of HLF to that of the CES-2 cell-death specification protein of Caenorhabditis elegans suggests a model of leukaemogenesis in which E2A-HLF blocks an early step within an evolutionarily conserved cell-death pathway .
 HLF, dimerization domain, bZIP, CES-2 cell-death specification protein, E2A-HLF, basic region/leucine zipper
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:
 HLF, dimerization domain, bZIP, CES-2 cell-death specification protein, E2A-HLF, basic region/leucine zipper