Petronella Kettunen (IMAGE) University of Gothenburg Caption Petronella Kettunen, Sahlgrenska Academy at the University of Gothenburg. Credit Photo by Johan Wingborg Usage Restrictions For editorial use when publishing news and other stories linked to the University of Gothenburg. Not for commercial use. 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.