![Cryo-EM map of mouse apoferritin](https://www2.mrc-lmb.cam.ac.uk/wordpress/wp-content/uploads/Ariescu_ior_10-20_Main_site_vignette-1-150x150.jpg)
Looking at the precise 3D arrangement of atoms within a protein helps us to understand how it can perform its functions. Radu Aricescu’s and Sjors Scheres’ groups have now been able to resolve individual atoms for the first time in a three-dimensional cryo-EM image.