25071
MeCP2 is a methyl - CpG - binding protein that is a main component of brain chromatin in vertebrates .
 Chemical: methyl
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: methyl 
Answer:
 Chemical: methyl