Safe Passage (IMAGE) Brown University Caption Microspheres (red) permeate the intestinal lining (green) on their way to the bloodstream in this image taken with a two-photon microscope. Eventually, microspheres could carry medication to targeted sites within the body. Credit Mathiowitz lab/Brown University Usage Restrictions with credit 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.