18463
For exploring the effect of polymer hydrophilicity on nanoparticle interactions with human umbilical vein endothelial cells ( HUVECs ) in vitro , a series of monomodal poly [ acrylonitrile - co - ( N - vinylpyrrolidone ) ] model nanoparticles with increasing hydrophilicity as related to their increasing content ( 0 - 30mol . % ) of N - vinylpyrrolidone ( NVP ) were synthesized by miniemulsion polymerization .
 Chemical: poly [ acrylonitrile - co - ( N - vinylpyrrolidone ) ]; Chemical: N - vinylpyrrolidone; Chemical: NVP
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: poly [ acrylonitrile - co - ( N - vinylpyrrolidone ) ], N - vinylpyrrolidone, NVP 
Answer:
 Chemical: poly [ acrylonitrile - co - ( N - vinylpyrrolidone ) ]; Chemical: N - vinylpyrrolidone; Chemical: NVP