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Different types of biomolecule can be conjugated to these brush layers by reaction of PGMA epoxide groups with amino groups in the biomolecule , while POEGMA , which resists nonspecific protein adsorption , provides an antifouling environment .
 PGMA, epoxide, amino, POEGMA
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 PGMA, epoxide, amino, POEGMA