Asynchronous Cell Division 551 Million Years Ago (image) Virginia Tech Share Print E-Mail Caption This image is a volume rendering of a 31-celled animal embryo from the Doushantuo Formation. Isosurface models of individual cells were generated by scanning the embryos with a microfocus X-ray CT-scanner at Amherst College, and generating polygon models that correspond to compositional variations in each cell membrane boundary. This embryo illustrates one of many instances of asynchronous cell division discovered by the international scientific team, and suggests that complex programs of cell division machinery had developed by at least 551 million years ago. Credit Provided by James Hagadorn Usage Restrictions With coverage of the discovery reported in Science Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.