The human immune system is a complex interaction of a multitude of cells, messenger substances and proteins. Numerous molecular biological processes are constantly taking place in our bodies to ensure that parasites and dangerous pathogens cannot cause any damage. Some of these signalling pathways are already well understood, but scientists are still largely in the dark about others. That is why researchers are working hard to better understand the immune system in order to develop more effective protective mechanisms or therapies against harmful organisms. At Max Planck, the Max Planck Institute of Immunobiology and Epigenetics in Freiburg is primarily responsible for this. But immunobiological or immunological research is also carried out at other MPIs, such as the MPI for Biophysics or the MPI for Colloids and Interfaces.