Stomach’s acid pump (IMAGE) Nagoya University Caption Structure of the gastric proton pump with two K+ ions determined by Cryo-Electron Microscopy. Credit Kazuhiro Abe, Nagoya University Usage Restrictions This image may be used with appropriate credit. License Original 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.