7486
Design of mixed PEO / PAA brushes with switchable properties toward protein adsorption .
 Chemical: PEO; Chemical: PAA
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: PEO, PAA 
Answer:
 Chemical: PEO; Chemical: PAA