Sniffing Immune Cells (IMAGE) Institute of Science and Technology Austria Caption This is a microscopic image of blood vessels (red), lymphatic vessels (green) and Chemokin CCL21 (blue), marked with different fluorescent colors. Credit © IST Austria / Sixt group 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.