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The effects of SiO2 NPs on gross morphological features of zebrafish embryos. (a) Representative images of embryos exposed to positively charged SiO2 NPs (25 nm) at 100 mg/L and (b) gross morphological changes after the exposure to 100 mg/L of 25 or 115 nm SiO2 NPs at 48 and 72 hpf. Data are represented as mean ± SD.
