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Interactions of the FAD molecule with E3 subunits. The hydrogen bonds formed between His-445′ and Glu-450′ are also shown, as well as the short (<3.5 Å) contacts between His-445′ and the sulfur atoms of Cys-45 and Cys-50 involved in the disulfide bond. ′ denotes residues from the other subunit.
