The researchers compared versions of both types of cells taken from rats, looking for differences in their chemistry after they had been subjected to an artificial stroke.

研究人员比较了取自大鼠的这两种类型细胞的变体，以找出它们在遭受人为中风后化学成分的差异。

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就隐藏在我们的基因组中，它们甚至有相同的临近基因。