- Reduction of Fe(III) ions complexed to physiological ligands by lipoyl dehydrogenase and other flavoenzymes in vitro: implications for an enzymatic reduction of Fe(III) ions of the labile iron pool. Petrat, F., Paluch, S., Dogruöz, E., Dörfler, P., Kirsch, M., Korth, H.G., Sustmann, R., de Groot, H. J. Biol. Chem. (2003)