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Schematic representation of the vertebrate SO enzyme. The protein is homodimeric, with each monomer consisting of Mo and heme domains connected by a flexible interdomain tether (these elements are indicated for one of the monomers). The specific conformation shown in the Figure and the distance between the Mo and Fe atoms, RMoFe = 32.3 Å, correspond to the published X-ray structure of the chicken SO (pdb 1SOX).8
