Protocodium_layers (IMAGE) University of Toronto Caption Combined image showing the external surface of Protocodium sinense (left), view through the outer layer made up of utricles (middle, colourized) and central siphons (right, colourized). Credit Cédric Aria Usage Restrictions For media use License Original content 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.