BK Polyomavirus (IMAGE) Brown University Caption Scientists found that switching just one amino acid in the virus changed the sugar it will bind to on the surface of victim cells. Credit Courtesy Atwood Lab/Brown University and Dr. Robert Garcea, University of Colorado at Boulder 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.