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。

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

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