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Although the transfection efficiency is lower than that of the commercially available transfection agent Lipofectamine 2000 , the R60 L20 vesicles are able to achieve transfection with significantly lower cytotoxicity and immunogenicity .
 Chemical: Lipofectamine 2000
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: Lipofectamine 2000