Cross Section of Mouse Esophagus (image) Centro Nacional de Investigaciones Oncologicas (CNIO) Share Print E-Mail Caption This is a cross section of a mouse esophagus. The dark brown staining shows epithelial cells containing NANOG protein. Credit CNIO Usage Restrictions None Share Print E-Mail 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.