Tentacle muscles (IMAGE) University of Innsbruck Caption Colored muscle strands in a hydra tentacle with faulty hippo signaling pathway Credit Maria Brooun Usage Restrictions Only use in connection with this press release 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.