Electron Micrograph (IMAGE) Osaka University Caption The upper image is an electron micrograph of human norovirus particles. On the lower image, a thin section of iPS cell-derived intestinal epithelial cells grown in vitro (blue indicates nuclei, green indicates cell-cell borders, and red indicates the epithelial brush border). 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.