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The present review entails a discussion of the toxicity of nanoparticles along with interferences inherent to nanoparticles in toxicity studies. The lack of availability of regulatory guidelines for nanoparticles is one of the biggest issues. Our understanding of the mechanisms of NP-induced toxicity is superficial; thus, it is too early to come to a general consensus on the toxicity of NPs. There is a need, therefore, to standardize and validate the toxicity testing assays based on NPs properties.

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