At the Max Planck Institute for Biology of Ageing in Cologne founded in 2008, three departments are working on the molecular, physiological and evolutionary mechanisms of the ageing of cells, tissue and organisms. The long-term aim of the research is to help people age more healthily. Here, Dr. Christian Kukat from the department of Professor Nils-Göran Larsson is examining the role played by mitochondria in the ageing process. In close collaboration with Dr. Christian Wurm from the research group of Professor Stefan Jakobs at the Max Planck Institute for Biophysical Chemistry in Göttingen and researchers at the University of Gothenburg, Sweden, they harnessed super-resolution STED microscopy to find out new and surprising facts about the mitochondrial nucleoid.