Johan Holmberg (IMAGE) Umea University Caption Johan Holmberg, Depart,ent of Molecular Biology, Umeå University, Sweden Credit Mattias Pettersson Usage Restrictions No restrictions. License Public Domain 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.