The one millimetre long roundworm Caenorhabditis elegans has been used as a model organism in scientific research, and has therefore been extensively examined. A research group led by Lena Kjellén, Uppsala University/SciLifeLab, has now demonstrated that the worm is an even more complete model system than previously thought, which could enable more detailed research into areas such as early embryonic development. The study was published in Scienctific Reports.