The NADH-dependent flavin reductase ThdF follows an ordered sequential mechanism though crystal structures reveal two FAD molecules in the active site
Horstmeier, H.J., Bork, S., Nagel, M.F., Keller, W., SproB, J., Diepold, N., Ruppel, M., Kottke, T., Niemann, H.H.(null) Journal Of Biological Chemistry