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Functionalized alkynyl polyvinyl alcohol magnetic microspheres ( PVA MMs ) were developed for the specific enrichment of sialic acid - rich glycoproteins by click chemistry .
 Chemical: alkynyl polyvinyl alcohol; Chemical: PVA; Chemical: sialic acid
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: alkynyl polyvinyl alcohol; Chemical: PVA; Chemical: sialic acid