Protein (IMAGE) Johns Hopkins Medicine Caption This is an illustration of the NOD1 protein. Researchers have found that a genetic mutation that alters NOD1's structure may increase susceptibility to human cytomegalovirus. Credit Wikimedia user <a href="https://en.wikipedia.org/wiki/User:Emw">EMW</a>. Permission is granted to copy, distribute and/or modify this document under the terms of the <a href="https://en.wikipedia.org/wiki/en:GNU_Free_Documentation_License">GNU Free Documentation License</a>, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License. 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.