Stefan K. Nilsson, Umea University (IMAGE) Umea University Caption This is Stefan K. Nilsson, assistant professor at the Department of Medical Biosciences at Umeå University in Sweden. Credit Mattias Pettersson Usage Restrictions This photo may only be used in contexts relating to this news release. 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.