On day 345 of #LMB365 we have a picture by Katja Röper in the Cell Biology Division. Shown is a confocal image of the two tissue primordia that will form the tubes of the salivary glands in a Drosophila embryo, a model system for the formation of tubular organs. Tube precursor cells are in pink, cell outlines are in blue. The Röper lab studies how important tubular organs form during development, from flies to humans.