10139
Herein , drug delivery carriers such as PEI - PLGA nanoparticles ( PEI - NPs ) and acetylated PEI - PLGA nanoparticles ( AcPEI - NPs ) were utilized to examine the effect of acetylation on NPs biocompatibility and genotoxicity , using human primary cells as in vitro model .
 Chemical: PEI; Chemical: PLGA; Chemical: PEI; Chemical: acetylated PEI; Chemical: PLGA; Chemical: AcPEI
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: PEI; Chemical: PLGA; Chemical: PEI; Chemical: acetylated PEI; Chemical: PLGA; Chemical: AcPEI