Figure 1.

Differential effect of ionizing radiation on phenotypes of zebrafish embryos according to irradiated time‐points during early developmental stages. Zebrafish embryos at 24 hpf after irradiation at 2, 4, or 6 hpf with doses of 0, 1, 5, and 10 Gy of radiation. Non‐irradiated control embryos were shown in the left end panels (0 Gy). Whole embryos irradiated at 2 hpf (64‐cell stage) showed the most severe phenotype. At a dose of 10 Gy, embryos irradiated at 2 hpf were dead, whereas those at 4 hpf (blastula stage) or 6 hpf (gastrula stage) showed normal body shape.