3523
Furthermore , SA - hypomethylation in particular appears to be associated with H3K9me3 , H3K27me3 , and Polycomb - group 2 target genes .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None