Probiotic bacteria illustration (IMAGE) University of Wisconsin-Madison Caption This schematic illustration shows probiotic bacteria (teal) coated in a layer of biomaterial as they travel through a human intestine. Attached to the bacteria are reactive oxygen species nano-scavengers. Credit Quanyin Hu Usage Restrictions None License Original 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.