19970
The results indicated that the toxicity of SWCNT , SWCNT - PAMAM and PAMAM in C2C12 cells can be strongly correlated with the charge of the nanomaterials .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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