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Polyhomeotic and Posterior Sex Combs may participate in a more general transcriptional mechanism that causes modulated gene repression , whereas the inclusion of Polycomb protein in the complex at PREs leads to stable silencing .
 Polyhomeotic and Posterior Sex Combs, Polycomb protein, PREs
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 Polyhomeotic and Posterior Sex Combs, Polycomb protein, PREs