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Significantly , compared to Lipofectamine 2000 , the ssCP - MSNs were more biocompatible , with low cytotoxicity ( even non - cytotoxicity ) and promotion of cell proliferation to HeLa - Luc cells .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 None