它们位于卵细胞的细胞质中。
细胞核已经从卵细胞中移除。
多利是277个卵细胞与乳腺细胞融合而成的唯一一只羊羔。
Dolly was the only lamb born from 277 fusions of oocytes with udder cells.
雌性储存精子，可以通过受精或不受精来决定每一个卵细胞的性别。
A female stores sperm and can determine the sex of each egg she lays by fertilizing it or leaving it unfertilized.
它们试图找到通过保护卵细胞的透明带的路。
They are trying to find their way through the zona pellucida, the membrane that surrounds and protects the egg.
卵细胞表面分布着大量的微绒毛。
FSH催促卵细胞在卵巢的成熟。
沈现从事于用动物卵细胞克隆人类干细胞。
She focuses on the cloning human embryonic stem cells using animal eggs.
总共使用了277个卵细胞，却只有一只多利羊存活。
In all, 277 eggs were used and only one lamb - Dolly - survived.
这张看上去像艺术家创作的太阳图，实际上是人类的卵细胞。
What looks like an artist's rendering of the sun is actually a human egg cell.
在筛选的八个卵细胞中，发现有六个呈现出严重的遗传异常。
Of the eight eggs they screened, six were found to have serious genetic abnormalities.
专家们通过在卵巢中使用含激素的药物刺激获得了9个卵细胞。
Doctors at the clinic collected nine eggs from the woman after stimulating her ovaries with standard hormone-based drugs.
下一步就是使得到的干细胞不再有多出来的那条来自卵细胞的染色体。
The next step is to try to create stem cells without the leftover chromosomes from the egg.
这项工作很重要，因为与其他体细胞不同，人类卵细胞是不可替代的。
This is an important job because human eggs are not replaced, unlike most cells in the body.
一个卵细胞的重量相当于约175 000个精细胞的重量。
It takes about 175, 000 sperm cells to weigh as much as a single egg cell.
多囊卵巢综合征：激素分泌紊乱引起卵巢产生出过多的卵细胞。
Polycystic ovary syndrome, a hormone disorder in which too many male hormones (androgens) are produced by the ovaries.
该项技术能够让医生检测卵细胞中的异常染色体，这通常是流产的主要原因。
The technique allows doctors to screen fresh eggs for abnormal chromosomes, which are a major cause of miscarriage.
高达一半以上年轻女性（39岁以后则高达75%）的卵细胞有异常染色体。
Up to half the eggs of younger women, and up to 75% in women over 39, have abnormal chromosomes.
这些卵细胞携带着最健康的染色体组，可以防止编译过程中的基因流失。
They pick the healthiest set of chromosomes, preventing the loss of vital variation.
他辩道，关键是，只有混合胚胎能够解决因广泛性的卵细胞捐献缺乏所带来的问题。
Crucially, only hybrids can help solve problems created by a worldwide lack of donated human eggs, he argues.
该诊所的医生使用标准体外受精的常用激素刺激该女子卵巢后，采集了她的卵细胞。
Doctors at the clinic collected eggs from the woman after stimulating her ovaries with hormones used in standard IVF treatment.
该项技术使医生可以检测妇女卵细胞中携带人类遗传密码的染色体的缺陷。
The technique allows doctors to check a woman's eggs for defective chromosomes, the structures that carry the human genetic code.
卵细胞在卵巢处产生和存储，在排卵过程中，卵巢将卵细胞释放到输卵管中。
They produce, store, and release eggs into the fallopian tubes in the process called ovulation (pronounced: av-yoo-lay-shun).
一个半世纪之后，当另一位科学家发现了人类卵细胞时，世界人口已经成倍增至十多亿。
A century and a halflater, when another scientist reported the discovery of human egg cells, theworld’s population had doubled to more than a billion.
科学家们从死鼠的器官中提取细胞核，移入到另一只活鼠的卵细胞中，最终克隆出了小鼠。
The scientists extracted a cell nucleus from an organ of a dead mouse and planted it into the egg of another mouse which was alive, leading to the birth of the cloned mouse.
但是这些卵细胞却不能正常发育，其原因主要是受精核外部的部分卵细胞有缺陷。
But they never developed properly, largely because of defects in parts of the egg outside the fertilized nucleus.
然而，类似的事情可以通过把人类细胞核植入其他物种(比如，一只兔子)的卵细胞来完成。
However, something similar could probably be made by inserting the nucleus of a human cell into the egg of another species, such as a rabbit.
然后他们把这个细胞核植入另一只狗的卵细胞中，而这个卵细胞的细胞核已经被移除。
They then transferred the fibroblast's nucleus to another dog's egg cell, with its nucleus removed.
然后他们把这个细胞核植入另一只狗的卵细胞中，而这个卵细胞的细胞核已经被移除。
They then transferred the fibroblast's nucleus to another dog's egg cell, with its nucleus removed.
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