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Number of studies on toxicity of nano-mixtures classified by group of test systems (A). Number of studies on toxicity of nano-mixtures classified by nanomaterials in nano-mixtures for crustaceans (B), fish (C), and bacteria (D). (SWCNT: single-walled carbon nanotube, MWCNT: multiple-walled carbon nanotube, NMs: nanomaterials).
