小白鼠胚胎时期，肾上腺皮质由永久皮质和胎儿皮质两部分组成。
During fetal period the adrenal cortex consists of fetal cortex and permanent cortex.
实际上bugle干细胞已经被证实起源比上述的猜想要早，在胚胎时期就已经开始形成。
The stem cells of the bulge are in fact established much earlier than previously suspected and begin to form in the embryo.
纯合子突变小鼠在各个胚胎时期都有预期中的出现比例，在大小与型态上并没有明显的缺陷。
Homozygous mutant mice showed expected ratio and no obvious defect in sizes and morphologies at all embryonic stages examined.
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