Plant and Animal Hormones (IMAGE) Max Planck Institute for Chemical Ecology Caption This graphic shows plant oxylipins (cis-OPDA, iso-OPDA) and prostaglandins, hormones that play important roles in regulating metabolism and development in plants and humans. In plants as well as in animals the hormones derive from the oxidation of unsaturated fatty acids. Credit MPI Chemical Ecology 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.