Sung Ryul Choi and Michel Steinmetz (IMAGE) Paul Scherrer Institute Caption Sung Ryul Choi (left), a biochemist at PSI and one of the first authors of the study, and Michel Steinmetz, Head of the Laboratory for Biomolecular Research at PSI, examining a protein sample. Credit Photo: Paul Scherrer Institute/Mahir Dzambegovic Usage Restrictions All media, such as photos, graphics and videos may only be used in the editorial context of these contents, naming the author. Archiving of this media is not permitted. 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.