Schematic Representation of a Centrosome (image) University of Vienna Caption This image shows a schematic representation of a centrosome. Two cylindrically shaped centrioles are surrounded by a dense mass of pericentriolar material (PCM) which organizes the microtubule-based spindle that segregates the chromosomes during cell division. B) Centrioles (red dots) at different stages of cell division. At the end of each division, the two centrioles of each centrosome are separated in preparation for another round of duplication in the next cell cycle. Credit Coypright: A. Dammermann Usage Restrictions The image may only be used with appropriate caption or credit. 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.