Axel and Anja (IMAGE) Max Planck Institute for Chemical Ecology Caption Axel Mithöfer and Anja Meents examine a sweet potato plant. Credit Angela Overmeyer, Max Planck Institute for 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.