DNA 1 (IMAGE) Rice University Caption The structure of poly-eta, an enzyme that helps direct DNA replication. A time-resolved crystallography study of the enzyme at Rice University uncovered the importance of a third metal ion that helps stabilize the process, ensuring accuracy. Credit Yang Gao Lab/Rice University Usage Restrictions NONE License Original 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.