Illustration of RNA (IMAGE) University of Michigan Caption Illustration of RNA bound to zinc-finger antiviral protein (ZAP). ZAP binds cytosine and guanine dinucleotides in viral RNA to prevent the virus from replicating and spreading infection. The specialized sites for the cytosine and guanine are highlighted in yellow. Credit Rajani Aroroa, U-M Life Sciences Institute. Usage Restrictions None 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.