Embryonic Stem cells(ES)can be derived from the early stage embryos of mammiferous animals.

从哺乳动物早期发育阶段的胚胎中可以得到胚胎干细胞。

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RT PCR analysis showed that the maternal mRNAs of the gibel carp M3 CK gene was detected in mature eggs and early stage embryos.

RT PCR表明，银鲫M3 CK基因在成熟卵母细胞和胚胎发育早期可检测到少量的转录产物，在胚胎发育期间从肌肉效应期开始转录，并一直持续表达。

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To study the effects of UVB on development of early stage embryos of amphibian, two-cell stage embryos of Bufo bufo gargarizans Cantor were irradiated by UVB with various intensity and time.

为了研究UVB对两栖类动物早期胚胎发育的影响，以中华大蟾蜍为研究对象，用UVB分别以不同强度和不同时间照射其二细胞期胚胎，观察记录胚胎的发育过程、统计死亡率并在形态学上对UVB照射诱导的畸胚进行分析。

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Embryonic stem cells, which originate from early stage embryos, are blank slates with the potential to become any type of tissue in the body.

BBC: Edinburgh scientists use 3D printing to produce stem cells

For some, embryonic stem cell research requires the taking of a human life, but for others, it represents the acceptable use of cells from very early stage embryos that would never have developed into a person.

CNN: Looking for middle ground in a minefield

The problem is that making them using somatic-cell nuclear transfer involves breaking up viable embryos, since the cells in question are found inside early-stage embryos, called blastocysts.

ECONOMIST: Human embryonic stem cells