Vascular Stent (IMAGE) Children's Hospital of Philadelphia Caption Two hours after local delivery of fluorescently labeled magnetic nanoparticles, the red areas indicate significantly larger amounts of nanoparticles in vascular stents in the presence of a magnetic field (A) compared to no magnetic field (B). Credit The Children's Hospital of Philadelphia 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.