Nocturnin (IMAGE) Princeton University Caption A new study reveals the mechanism by which the circadian clock enzyme Nocturnin interacts with its target, NADPH, to affect energy regulation and metabolic functions. Credit Michael Estrella, Jin Du and Alexei Korennykh, Princeton University Usage Restrictions Credit: Michael Estrella, Jin Du and Alexei Korennykh, Princeton University 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.