Immune Cells (video) Washington University School of Medicine Loading video... Caption Working in mice, scientists at Washington University School of Medicine in St. Louis have used two‑photon imaging to capture the first images of a beating heart at a resolution so detailed they can track individual immune cells swarming into the heart, causing inflammation. These immune cells, shown in green, are moving from the blood vessels in the heart into the heart muscle, where they cause damage. Credit Washington University in St. Louis Usage Restrictions None 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.