Fig. 1 (IMAGE) Osaka University Caption (A) Extra-large crystal of a copper amine oxidase. (B) Three-dimensional structure of the copper amine oxidase including hydrogen atoms. An unusual "levitated" proton is presented in the center of enlarged view. Credit Osaka University 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.