The toxicity of PND on zebrafish embryo development was studied. (a) Effects of PND on embryo mortality rate of zebrafish. (b) The effect of PND exposure to 72 hpf on zebrafish embryo edema rate. (c) The relative edema area of zebrafish embryos induced by PND. (d) Exposure to PND decreased the heart rate of zebrafish embryos. (e) Exposure to different concentrations of PND reduced the body length of zebrafish embryos. The values are expressed as the mean ± standard deviation of three independent experiments. *p < 0.05, **p < 0.01, ***p < 0.001. Different letters above bars mean significant differences between different treatments at p < 0.05 (Means ± S.E.).
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