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However , our previous results show that polyethylene glycol - coated Ag - NPs strongly bind to Hb and effect on the secondary and tertiary structures of BHb .
 Chemical: polyethylene glycol; Chemical: Ag
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: polyethylene glycol; Chemical: Ag