Nanoparticles (IMAGE) Johns Hopkins Medicine Caption A microscopic image of the nanoparticles used in the study. The black scale bar is 100 nm in size. Credit Jordan Green and Stephany Tzeng 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.