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Fig. 1 TCE exposure induced cardiac defects in the early developmental stages of zebrafish embryos. A The experimental process overview diagram of this study. B Morphological images of zebrafish embryos at 72 hpf. Circles present atrium (blue) or ventricle (red), yellow lines present the distance of SV-BA. (n = 30). C The heart beat rate, D pericardium area, E distance of SV-BA and F the thickness of ventricular myocardium of zebrafish embryos at 72 hpf. G Representative images of histologic section stained by hematoxylins-eosin of zebrafish at 120 hpf. (n = 6). Dotted lines depict heart (black) or valve (blue), arrows indicate atrioventricular valve (blue) or trabeculae of myocardium (red). Ctrl, control. TCE, trichloroethylene, 760 nM. **, P < 0.01; ****, P < 0.0001 vs control