但是，胚胎的道德地位是讨论的实质。
But, the moral status of embryo is at the heart of the discussion.
有可能是在胚胎的神经系统开始形成的时候。
A likely moment occurs as the embryos' nervous systems begin to form.
目的观察小鼠胚胎的体外发育及种植过程。
Objective To observe the growth and implantation of mouse embryos in vitro.
目的寻求一种体外稳定培养早期胚胎的方法。
Objective To find out a stable way of in vitro culture of early embryo.
胚胎的发育过程中，血清和氨基酸都是必需的。
And serum and amino acid are necessary for embryo development.
结论输卵管积水能显著影响胚胎的早期发育潜能。
Conclusion: Hydrosalpinx fluid may affect the ability of mouse early embryo development in vitro.
前期仔鱼的造温范围与胚胎的适温范围基本一致。
The suitable temperature range for early larvae was basically the same with that for embryo.
胚胎研究是个让人情绪激动的问题。
全国各地的诊所里有24000个冷冻胚胎。
There are 24,000 frozen embryos in clinics across the country.
许多物种的早期胚胎具有其祖先的特性。
那么水藻到底是如何进入胚胎里的呢？
该项研究大大扩展了我们对于胚胎发育以及衰老和疾病的认识。
The research greatly expanded knowledge about embryonic development as well as aging and disease.
半个欧洲反对胚胎干细胞的研究。
胚胎是从一个完美对称的单细胞开始的。
他们还对更早期的胚胎细胞进行标记跟踪，以确定移植的细胞如何愈合。
Then they labeled cells in even earlier embryos to track where they wound up.
这写蛋白质在人类胚胎发育的时候似乎尤其活跃。
The protein seems to be especially active while human embryos are developing.
唯一的区别在于染色体的水平，它埋藏在胚胎细胞的深处。
The only difference is at the chromosomal level, deep inside the embryos' cells.
这些照片也许是最细致入微的动物胚胎写真了。
They are the most detailed embryonic animal pictures ever seen.
生物学里有一个经典的比喻：胚胎细胞就像山顶上的石块。
A classic metaphor in biology pictures an embryonic cell at the top of a hill.
实验胚胎学潜能是非常惊人的。
胚胎发育一直是生命科学研究的主题之一。
Embryo development is one of the most important subjects in life science research.
因为现今的联邦法律已经禁止使用联邦基金克隆胚胎人类后裔在出生。
Because current federal law already forbids the use of federal funds.
这就是胚胎5到7天大的时候的样子。
That is what embryos look like when they are between five and seven days old.
近来的研究表明干扰素在哺乳动物早期胚胎发育中有重要的作用。
Recent research has proved that interferons play very important role in early embryo development.
他说，“我们真的想进行一次针对首次胚胎干细胞临床试验最好的试验，但不是这项试验。”
"We really want the best trial to be done for this first trial, and this might not be it," he said.
你可能也要考虑减少你怀孕的胚胎数目。
You may also wish to consider reducing the number of embryos you are carrying.
动物细胞在胚胎发育的较早阶段便失去了其全能性。
Animal cells lose their totipotency at an early stage in embryonic development.
胚胎中的未分化细胞按被定型的命运不可逆地发育成特定类型细胞的过程。
Developmental program — The process by which a cell in an embryo achieves its fate.
胚胎中的未分化细胞按被定型的命运不可逆地发育成特定类型细胞的过程。
Developmental program — The process by which a cell in an embryo achieves its fate.
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