Amino Acids, SulfurMethionineCysteineSulfurCystineAmino AcidsTaurineSulfur CompoundsCysteine DioxygenaseNutritional RequirementsSulfatesDietary ProteinsSulfur IsotopesHomocysteineGlutathioneCystathionine gamma-LyaseNitrogenAmino Acids, Branched-ChainHomocystineCysteine SynthaseDietBetaine-Homocysteine S-MethyltransferaseLiverVitamin UVegetable ProteinsCystathionine beta-SynthaseCystathionineSequence Homology, Amino AcidCarbon Isotopes