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Patent Granted Vitamin K epoxide reductase (VKOR) is an enzyme (EC 1.1.4.1) that reduces vitamin K after it has been oxidised in the carboxylation of glutamic acid residues in blood coagulation enzymes. VKORC is a member of a large family of predicted enzymes that are present in vertebrates, Drosophila, plants, bacteria and archaea.[1] Its C1 subunit (VKORC1) is the target of anticoagulant warfarin.