Microcaps (image) NASA/Johnson Space Center Caption The oil (blue) contains a visualization marker that is traceable by ultrasound and C-T scans to allow doctors to follow the microcapsules (brown) during site-specific delivery to the tumor. The semipermeable outer skin has the physical ability to time-release the drug slowly. Credit NuVue Therapeutics, Inc. Usage Restrictions NuVue Therapeutics, Inc. 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.