在这八周了，这些染色体是男性胚胎和女性胚胎的唯一区别。
For a few weeks, these chromosomes are all that differentiates male embryos from female embryos.
把脑组织或者小鼠胚胎浸入这种试剂，两周就可以得到透明的样品。
Soaking brains and even entire mouse embryos in the chemical solution for two weeks rendered them transparent.
怀孕四周后，将会变成科瑞娜的胚胎每分钟会50万个神经细胞。
Four weeks after conception, the embryo that would become Corina was producing half a million neurons every minute.
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