10136
The genotoxicity of PEI - based nanoparticles is reduced by acetylation of polyethylenimine amines in human primary cells .
 Chemical: PEI; Chemical: polyethylenimine amines
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: polyethylenimine amines