29642
Results for the potential energy of interaction measured for model polyplex ( e . g . , PEI - coated sphere ) interacting with a PEI - coated glass surface in the presence of overdosed free PEI chains at various pH values and salt concentrations were presented .
 Chemical: PEI; Chemical: PEI; 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: PEI; Chemical: PEI; Chemical: PEI