MSC Picture (IMAGE) CNRS Caption Synthesis of magnetic nanoparticles within stem cells, starting from the degradation product from previously internalized nanoparticles. These biosynthesized nanoparticles are produced in situ within endosomes (white arrows) and measure 8 nm on average. Credit Laboratory MSC (CNRS/University of Paris Diderot). 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.