Lymphatic Valves (IMAGE) University of South Florida (USF Health) Caption Green immunostained image of a lymphatic vessel with one valve in the center and another in the top left corner. To the upper right of the lymph vessel is a large vein. Credit © University of South Florida Usage Restrictions Please use photo with appropriate caption. 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.