We talk with Tess Branon about TurboID, a new tool she developed in Alice Ting's lab at MIT and Stanford University. TurboID can be added to any protein to label what’s around it, letting scientists find out what a protein’s doing by who it’s interacting with — even in whole animals. We pick apart Tess's abstract to see how she used directed evolution to perfect this powerful tool. See the original article at: https://www.nature.com/articles/nbt.4201