8284
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 .
 GENE: Polyhomeotic and Posterior Sex Combs; GENE: Polycomb protein; GENE: PREs
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
 Entities: Polyhomeotic and Posterior Sex Combs, Polycomb protein, PREs 
Answer:
 GENE: Polyhomeotic and Posterior Sex Combs; GENE: Polycomb protein; GENE: PREs