Biology--Bacterial Breakdown (IMAGE) DOE/Oak Ridge National Laboratory Caption While studying a specific vitamin B12 derivative, an ORNL-led team discovered a "helper molecule" (shown in red) in an often-overlooked region of the vitamin's structure, an area that critically determines how enzymes break down toxic chlorinated solvents. Credit Credit: Oak Ridge National Laboratory, US Department 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.