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They have also gained importance as gene carriers in biomedical applications , in which the anionic DNA chains are complexed and condensed to form PEI / DNA polyplexes .
 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