The nucleus, the command center of the eukaryotic cell, is separated from the cytoplasm by the nuclear envelope. At the beginning of cell division the nuclear envelope breaks down and DNA massively condenses to form chromosomes. The chromosomes are then equally distributed to the two emerging daughter cells. After this process is completed, chromosomes decondense and a new nuclear envelope is formed. The formation of the new nuclear envelope is a complex interplay of cellular membranes and proteins which scientists at the Friedrich-Miescher-Laboratory in Tübingen now try to understand.