An extra detector on an electron microscope can help determine which molecules are found in which parts of a cell. This is what scientists at the UMCG and Delft University of Technology report in an article published today in the journal Scientific Reports. “This detector enables us to assign a colour to molecules in a cell,” says Ben Giepmans, the team leader from Groningen. “Multicolour electron microscopes are a new addition to medical research, and they could generate interesting results.”