Tumor (IMAGE) University of Chicago Medical Center Caption This is an intratumoral lymphatic vessel (green) imaged in the microenvironment (red) of a Braf-driven primary mouse melanoma tumor. Credit EPFL 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.