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

中有一种重要的质叫成素。

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

与觅食者相比，变的工蚁体内含有更高水平的蛋白原，是一种与长寿相关的多用途蛋白质。