13185
First , biomimetic methacrylate polymer brushes containing tethered neurotransmitter acetylcholine functionalities in the form of dimethylaminoethyl methacrylate or free hydroxyl - terminated poly ( ethylene glycol ) units were prepared using the " grown from " method through surface - initiated atom transfer radical polymerization reactions .
 Chemical: methacrylate; Chemical: acetylcholine; Chemical: dimethylaminoethyl methacrylate; Chemical: hydroxyl; Chemical: poly ( ethylene glycol )
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: methacrylate, acetylcholine, dimethylaminoethyl methacrylate, hydroxyl, poly ( ethylene glycol ) 
Answer:
 Chemical: methacrylate; Chemical: acetylcholine; Chemical: dimethylaminoethyl methacrylate; Chemical: hydroxyl; Chemical: poly ( ethylene glycol )