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In order to enhance siRNA lipoplexes efficiency , the addition of polyglutamate as anionic polymer should be preferred to plasmid DNA as far as in vitro as well as in vivo toxicity is concerned .
 Chemical: polyglutamate
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: polyglutamate