The Mouth of a Coral Polyp (IMAGE) Weizmann Institute of Science Caption The mouth of a coral polyp (center): Symbiotic algae are labeled in red, pathogenic bacteria that enter through this region are labeled in blue. Credit Weizmann Institute of Science Usage Restrictions None License Licensed 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.