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Phenotypic changes of zebrafish embryos at 48 hpf. (A-1, A-2) Control group. (B1-3) UCNPs<200μg/mL groups. (C1-5) UCNPs 200-400μg/mL groups. Abbreviations: b, brain; e, eye; n, notochord; t, tail; ys, yolk sac; bs, bent spine; tm, tail malformation; oe, ocular edema; pe, pericardial edema; oy, opaque yolk; yes, yolk sac edema; and ynd, yolk not depleted.
