Macrophage-mediated Vascular Bursting (IMAGE) Massachusetts General Hospital Caption In this illustration based on in vivo microscopy, a tumor-associated macrophage (green) induces a burst of leakage from a tumor blood vessel (red), which releases nanoparticles into the tumor tissue (yellow). The large arrow shows nanoparticles being taken up by the macrophage, while the small dashed arrow depicts how the macrophage elicits further nanoparticle delivery via vascular bursting. Credit Miles Miller, PhD, and Ralph Weissleder, MD, PhD; Center for Systems Biology, Massachusetts General Hospital Usage Restrictions Usage restricted to coverage of the paper described in this release. 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.