size: 275 KB, MIME type: image/png) [ edit ] Summary Description Ribbon diagram of human erythrocytic NADH cytochrome-b 5 reductase ( methemoglobin reductase ), with FAD bound. Created using Accelrys DS Visualizer Pro 1.6 and GIMP . Date 5 May 2007 ( 2007-05-05 ) Source From PDB entry 1UMK . Author