VSOP (IMAGE) National Institute for Physiological Sciences Caption VSOP/Hv (middle) usually forms a dimer but each subunit can carry protons without making any assembling hole. Credit (c) Yasuhi Okamura Usage Restrictions Contact Yasushi Okamura 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.