Mammalian primordial germ cells form and migrate to the gonad during embryonic development.

在胚胎发育时期，原始生殖细胞形成并迁移至生殖腺，形成种系囊。

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Objective:To isolate and clone bovine embryonic stem cells from bovine fetus Primordial germ cells(PGCs).

目的从牛原始生殖细胞中分离克隆牛胚胎干细胞。

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But the cells from the first divisions retain the ability to form entire new embryos themselves. (This is how identical twins form.) Germ-line manipulation would require taking some of these early-embryonic cells apart in order to discover what the genetic lottery had delivered to them (a process that would destroy the cells in question).

ECONOMIST: A survey of the human genome