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Toxicity of Ag nanosphere (20 nm) at low concentrations, representing relative amounts corresponding to the MWCNT (12.5 to 50 μg/mL), by two different assays. A) Toxicity in C57BL/6 alveolar macrophages by LDH assay. B) Toxicity/proliferation in C57BL/6 alveolar macrophages by MTS assay. C) Toxicity in THP-1 cells by LDH assay. D) Toxicity/proliferation in THP-1 cells by MTS assay.
