Experimental agarose assay (VIDEO) Institute of Science and Technology Austria This video is under embargo. Please login to access this video. Caption The video shows the collective migration of dendritic cells (magenta) over several hours. By consuming the chemokine CCL19, cells generate a dynamic gradient that guides them to move away from the source at the bottom. Credit © Sixt group/Science Immunology Usage Restrictions Free use for reporting on paper. 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.