The worm turns

Theodor Boveri was a developmental biologist, who did some important early work on cell division using Ascaris, a species of parasitic nematode worm. I wasn't familiar with his work, but scanned this recent review article.

The article ends saying that Boveri actually became infected with these parasites late in life, leading him to write:

It is mean when the beasts you have worked on, now start working on you.