Nanoparticles (IMAGE) Johns Hopkins Medicine Caption Nanoparticles releasing microRNAs (light blue) inside a human brain cancer cell. Credit: Yuan Rui, Johns Hopkins Credit Yuan Rui, Johns Hopkins 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.