The pancreas is a crucial organ for eating behavior, digestion and metabolism and it plays a major role in the development of diabetes. In so called “Langerhans Islets”, specialized groups of cells precisely regulate blood sugar. But they are hard to study, only a few molecular markers are known to differentiate those pancreatic cell types. With the first single cell transcriptomes, established by Stefan Kubicek and Christoph Bock at CeMM, a new powerful tool for future investigations has been created to overcome those problems.