10138
Polyethylenimine ( PEI ) is a highly positive charged polymer and is known to have varying degree of toxic effect to cells based on its chemical structure ( i . e . , amount of primary and secondary amine ) .
 Chemical: Polyethylenimine; Chemical: PEI; Chemical: primary and secondary amine
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: Polyethylenimine; Chemical: PEI; Chemical: primary and secondary amine