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Using a fragment of K protein as bait in the yeast two-hybrid screen , we isolated a cDNA that encodes a protein whose primary structure has extensive similarity to the Drosophila melanogaster extra sex combs (esc) gene product , Esc , a putative silencer of homeotic genes .
 homeotic genes, Drosophila melanogaster extra sex combs (esc) gene product, cDNA, Esc, K protein
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:
 homeotic genes, Drosophila melanogaster extra sex combs (esc) gene product, cDNA, Esc, K protein