Glycans (IMAGE) Virginia Tech Caption Glycans are chains of sugars that have critical roles in health and disease. Here, a depiction of a glycan molecule is overlaid on a photograph of human cells. Background photo by Katelyn Bittleman, Virginia Tech; foreground image by Robert Woods, University of Georgia. Credit Virginia Tech Usage Restrictions Credit Virginia Tech 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.