Since the opening of the Synchrotron Light Source Switzerland (SLS), structural biology has been a further focus of research in the field of human health. Here, the structure and function of biomolecules are being investigated – preferably at atomic resolution. The PSI researchers are primarily concerned with proteins. Every living cell needs a myriad of these molecules in order, for example, to be able to metabolise, receive and transmit signals or to divide. The aim is to understand these life processes better and thus to be able to treat or prevent diseases more effectively.