14014
Two poly ( styrene oxide ) - poly ( ethylene oxide ) ( PSO - PEO ) triblock copolymers with different chain lengths were analyzed as potential chemotherapeutic nanocarriers , and their ability to inhibit the P - glycoprotein ( P - gp ) efflux pump in a multidrug resistant ( MDR ) cell line were measured in order to establish possible cell - responses induced by the presence of the copolymer molecules .
 Chemical: poly ( styrene oxide ) - poly ( ethylene oxide ); Chemical: PSO - PEO
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 ( styrene oxide ) - poly ( ethylene oxide ); Chemical: PSO - PEO