20100
Cell adhesion and proliferation are controlled by three - dimensional poly ( ethylene glycol ) - dimethacrylate ( PEG - DMA ) microstructures .
 Chemical: poly ( ethylene glycol ) - dimethacrylate; Chemical: PEG - DMA
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: poly ( ethylene glycol ) - dimethacrylate, PEG - DMA 
Answer:
 Chemical: poly ( ethylene glycol ) - dimethacrylate; Chemical: PEG - DMA