Alkmark-Hagberg-Keulen-Wennerholm (IMAGE) University of Gothenburg Caption Mårten Alkmark, Henrik Hagberg, Judit Keulen and Ulla-Britt Wennerholm Credit Photo: University of Gothenburg, University of Amsterdam 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.