To better understand living matter such as cells and therefore to better treat diseases, we need to understand how molecules and cells interact with each other. Importantly, we need to understand the physics behind it, i.e. the biophysics. For this, scientist rely on highly sensitive and non-invasive analysis techniques, including far-field fluorescence microscopy. The aim of the Biological Imaging Department is providing optimized observation techniques to in more detail understand molecular and cellular interactions especially on membranes. To do so we need to learn about the shortcomings of existing techniques and how to overcome them. The department is doing so through several collaborative cell-biological and biomedical research projects.