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In this work , we investigate assembly of HNP based on a polymer with decades of prominence in the biomedical field , poly ( vinyl alcohol ) , PVA .
 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