17160
Following global demethylation and sex determination , CpG sites switched to de novo methylation in males , but the X - linked genes appeared resistant to the wave of de novo methylation .
 Chemical: CpG
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: CpG