HgcAB Protein Complex (IMAGE) DOE/Oak Ridge National Laboratory Caption A structural model of HgcA, shown in cyan, and HgcB, shown in purple, were created using metagenomic techniques to better understand the transformation of mercury into its toxic form, methylmercury. Credit Connor Cooper, Oak Ridge National Laboratory/U.S. Dept. of Energy. 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.