Graphic of the mechanism (IMAGE) Max Planck Institute for Marine Microbiology Caption This graphic shows the enzyme F420H2-Oxidase and the way it works. The cyan y-formed part is the gas-channel. The red arrow shows the way in of the oxygen to the catalytic cavity containing iron. The green arrow symbolizes the way out of the water. Yet, the blue-red sticks in the middle shows the flavin (FMN) accepting electrons from the reduced coenzyme F420, which brings the hydrogen necessary to convert the oxygen into water. Credit S. Engilberge and T. Wagner Usage Restrictions Only to be used in the context of this publication and citing the correct copyright 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.