Many people object to experimentation on embryos.
许多人反对用胚胎做实验。
There are 24,000 frozen embryos in clinics across the country.
全国各地的诊所里有24000个冷冻胚胎。
The paper provides a detailed description of how to create human embryos by cloning.
这篇论文对如何通过克隆制造人类胚胎提供详细的描述。
Snake embryos, for example, sprout hind limb buds.
例如，蛇的胚胎会生长出后肢。
Early embryos of many species develop ancestral features.
许多物种的早期胚胎具有其祖先的特性。
If it is cut in a plane different from the one used by the early investigators, it will not form two whole embryos.
如果在一个不同于早期研究人员所使用的平面上切割，就不会形成两个完整的胚胎。
The international trade in semen and embryos from cloned animals created in north and south America and beyond was effectively impossible to police.
在北美，南美以及其他一些地方生产的精子和克隆动物胚胎，其在国际范围内的交易已经无法加以有效监管。
Nearly a century ago, biologists found that if they separated an invertebrate animal embryo into two parts at an early stage of its life, it would survive and develop as two normal embryos.
近一个世纪前，生物学家发现，如果他们在无脊椎动物胚胎生命的早期阶段将其分成两部分，它会存活下来并发育成两个正常的胚胎。
The most successful groups of land plants are those that evolved methods of fertilized sex cell dispersal that are independent of water and structures that protest developing embryos from drying out.
最成功的陆生植物群体是那些进化出了受精性细胞散布方法的群体，这些方法不依赖于水和防止发育中的胚胎干涸的结构。
Studying the fruit fly, a household nuisance but a time-honored experimental subject, has enabled the secrets of how embryos develop to begin to be unraveled by scientists.
果蝇在家中招人讨厌，但却是一个历史悠久的实验对象。通过研究果蝇，科学家们得以揭开胚胎发育的秘密。
Because current federal law already forbids the use of federal funds to create embryos for research or to knowingly endanger an embryo 's life, NBAC will remain silent on embryo research.
因为现今的联邦法律已经禁止使用联邦基金克隆胚胎用于研究或者有意地威胁胚胎的生命，NBAC在胚胎研究上将保持沉默。
The exact number of embryos lost to cryoinjury varies.
冷冻损伤胚胎的确切数目各不相同。
TJP2 is crucial during development as silencing inhibits blastocele formation in mouse embryos.
TJP2 在发育过程中至关重要，因为沉默会抑制小鼠胚胎中的胚泡形成。
But it is active only in embryos.
可是它仅仅在晶胚中才具有活性。
The process destroys the embryos.
这一过程要毁灭胚胎。
So how might the algae enter the embryos?
那么水藻到底是如何进入胚胎里的呢？
Stem cells were recovered from these embryos.
干细胞就是从这些早期胚胎上得到的。
Have you ever looked at pictures of embryos?
你有没有看过胎儿的照片？
However, all human embryos initially have a tail.
不过，所有的人类胚胎最初都有一根尾巴。
The most versatile ones are derived from embryos.
最万能的那一种取自于胚胎。
Human embryos have to be destroyed to produce stem cells.
人类胚胎破坏后才能产生干细胞。
And the embryos bask in the oxygen given off by the algae.
胚胎也因为藻类产生的氧气而受益。
Related series: growing embryos for transplantable organs.
相关系列：越来越多利用胚胎来移植器官。
They froze the embryos. A year later, Mr Roman filed for divorce.
于是他们将所有胚胎都冷冻起来，一年之后，罗曼先生提出离婚。
A likely moment occurs as the embryos' nervous systems begin to form.
有可能是在胚胎的神经系统开始形成的时候。
But such experiments destroy human embryos, so right-to-lifers object.
但是这种试验破坏人类胚胎，因此保护胎儿生存权利运动者反对。
Precisely what doctors are supposed to do with these embryos is unclear.
医生们该拿这些胚胎怎么办，具体事项还不甚明了。
Without syncytin, mice developed deformed placentas, and their embryos died.
没有合胞体蛋白，老鼠的胎盘畸形生长，胚胎死亡。
The protein seems to be especially active while human embryos are developing.
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.
这写蛋白质在人类胚胎发育的时候似乎尤其活跃。
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