In 2008, researchers found just that: Fragments of once-active egg yolk genes, hidden in our own genome and when they compared our versions to the chicken versions, they even had the same neighboring genes around them.

2008 研究人员发现：他对比人类的基因片段和鸡的基因片段时发现，曾经活跃的卵黄基因片段隐藏在我的基因组中，甚至有相同的临近基因。

When the hatchlings run out of yolk from their own eggs, they eat the other eggs and hatchlings until one baby shark from each oviduct remains.

当幼体用光了自己卵中的卵黄，会吃掉其卵和幼体直到个输卵管里只剩下一个小。

The researchers say that model contains embryonic tissues and other tissues that can produce structures surrounding the embryo, such as the placenta and yolk material.

研究人员表示，该模型包含胚胎组织和其他可以在胚胎周围产生结构的组织，如胎盘和卵黄物质。

When her eggs are fertilized, the yolk will provide enough nutrition to keep a growing dinosaur embryo alive for as long as three months.

当的蛋受精后卵黄将会提供充足的营养来使发育中的恐龙胚胎存活三个月。

Each egg contains one embryo and a yolk sac which the embryo feeds off and helps it develop inside the egg.

枚卵中含有一个胚胎和一个卵黄囊，胚胎从卵黄囊中汲取营养，从而得以在卵中发育。

Unlike birds or turtles, our eggs don't make a yolk, or even a shell.

不像鸟或乌龟，人类的卵子不形成卵黄，甚至外壳。

There's an essential ingredient in egg yolks called vitellogenin.

卵黄中有一种重要的物质叫卵黄生成素。

It starts with an unfertilized egg cell, added to a blob of yolk, and squeezed down a stretchy tube called an oviduct.

始于将未受精的卵细胞添加到一团卵黄并挤压一个称为输卵管的弹性管。

Inside a chicken egg, the growing embryo produces something called a yolk sac.

在鸡蛋里面，成长的胚胎产生一种名为卵黄囊的东西。

Humans make an empty yolk sac, and it disappears halfway through pregnancy.

人类在孕期会产生一个空卵黄囊，但是中途消失了。

If we really are descended from animals that once laid eggs full of yolk, can we find some leftover of that yolky gene hidden in human DNA?

如果我真的是从那些下的蛋里充满了卵黄的动物进化而来，我能从人类的基因里面找到隐藏的卵黄基因遗迹吗？

So you'd think–no yolk, no yolk sac.

所以你会认为我不需要卵黄，也不需要卵黄囊。