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“In vitro, methimazole was found to inhibit the vitamin K-dependent step in coagulation factor synthesis, the gamma-carboxylation of glutamic acid , and, in addition, the vitamin K epoxide reductase, an enzyme related to the carboxylation reaction.”
“Both were found in vitro to inhibit the vitamin K dependent step in clotting factor synthesis, the gamma-carboxylation of glutamic acid with 50 per cent inhibitory concentrations of 2 mM for propylthiouracil and 0.1 mM for methimazole.”