7884
The optimal polymer , P ( GMA - TEPA ) ( 50 ) , provided comparable transfection efficiency but lower cytotoxicity than PEI .
 Chemical: P ( GMA - TEPA ) ( 50 ); Chemical: PEI
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: P ( GMA - TEPA ) ( 50 ); Chemical: PEI