Using X-ray crystallography and cryo-electron microscopy, an international team of scientists unravel the atomic structure of the proteins P1 and P40/P90 which make up the ‘Nap’ structure – a protein complex that the bacterium M. pneumoniae uses to attach and move around human cells to cause pneumonia. This will allow us to better understand the ”Nap” structure and develop medicine and vaccines that stop the bacterium from infecting humans.