TOPICS: Epixode rectase, vitamin K activation, warfarin, cofactor for the gamma-carboxylation of glutamic acid residues, intestinal flora, antibiotic use, vitamin K deficiency, neonatal hemorrhage, vitamin K injections, PTT, PT, protein C maturation, protein S maturation, factor IX maturation, factor VII maturation, breast milk, factor II (thrombin) maturation, factor X maturation, menaquinone, phytomenadione, phytonadione, phylloquinone