TH (IMAGE) The University of Bergen Caption Left: Two views of the 3D structure of TH, with the atomic model generated inside, where the yellow stars point to two of the active centers of TH. Right: The same two views of the 3D structure in the presence of dopamine, which regulate TH by inhibiting activity via the introduction of a helical part of the protein (marked with a red arrow) in the active center. Credit UiB 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.