Randall Johnson and Helene Rundqvist (IMAGE) Karolinska Institutet Caption Randall Johnson and Helene Rundqvist, researchers from Karolinska Institutet. Credit Stefan Zimmerman 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.