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

在鸡里面，成长胚胎种名为卵黄囊东西。

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

卵黄中有种重要物质叫卵黄成素。

Compared to foragers, these converted workers have higher levels of vitellogenin, a multipurpose protein linked with longevity.

与觅食者比，这些转变工蚁体内含有更高水平卵黄白原，这是种与长寿关多用途白质。

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?

如果我们真是从那些下里充满了卵黄动物进化而来，我们能从人类基因里面找到隐藏卵黄基因遗迹吗？

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

当它精后卵黄将会提供充足营养来使发育中恐龙胚胎存活三个月。

The second subtype is a yolk sac tumor, also called an endodermal sinus tumor, and it's made of germ cells that differentiate into yolk sac tissue.

第二种亚型是卵黄囊瘤，也称为内胚层窦瘤，是由分化为卵黄囊殖细胞组成。

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卵黄，它们就会吃掉其它卵和幼体直到每个输卵管里只剩下个小鲨鱼。

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年 研究人员发现：他们对比人类基因片段和鸡基因片段时发现，曾经活跃卵黄基因片段就隐藏在我们基因组中，它们甚至有同临近基因。