cGAS image (IMAGE) University of North Carolina Health Care Caption The first-ever high-resolution structure of the protein cGAS (teal, top) bound to the nucleosome -- the DNA packaging unit inside the nucleus of a human cell. Credit UNC-Chapel Hill 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.