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In this work , bioconjugation techniques are developed to achieve peptide functionalization of poly ( vinyl alcohol ) , PVA , as both a polymer in solution and within microstructured physical hydrogels , in both cases under physiological conditions .
 Chemical: poly ( vinyl alcohol ); Chemical: PVA
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: poly ( vinyl alcohol ); Chemical: PVA