Enzyme Crystals (IMAGE) Max Planck Institute for Marine Microbiology Caption Pictures of F420H2-oxidase crystals obtained aerobically with a typical size of 0.1 mm. With oxygen the Fe and flavin inside the enzyme give the natural yellow color to the crystals. Bilder von F420H2-Oxidase-Kristallen mit einer typischen Größe von 0,1 mm. Zusammen mit Sauerstoff geben das Eisen und Flavin im Inneren des Enzyms den Kristallen die natürliche gelbe Farbe. Credit Max Planck Institute for Marine Microbiology/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.