illustration (IMAGE) UT Southwestern Medical Center Caption The mouse atrioventricular (AV) node. Green staining indicates AV node cells, while red staining highlights neighboring atrial muscle cells. All cell nuclei are stained blue. Credit UT Southwestern Medical Center Usage Restrictions none 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.