Proton-Coupled Folate TransporterReduced Folate Carrier ProteinFolic AcidFolate Receptors, GPI-AnchoredFolate Receptor 1Folic Acid TransportersProtonsFolic Acid AntagonistsMembrane Transport ProteinsTetrahydrofolatesMalabsorption SyndromesFolic Acid DeficiencyAminopterinFolate Receptor 2Biological TransportCarrier ProteinsUricosuric AgentsMethotrexateProton PumpsAnion Transport ProteinsATP-Binding Cassette TransportersHydrogen-Ion ConcentrationVitamin B 12GlutamatesHomocysteineIntestinal AbsorptionMolecular Sequence DataHeLa CellsReceptors, Cell SurfaceOrganic Anion TransportersPteroylpolyglutamic AcidsAmino Acid SequenceGuanineKineticsVitamin B ComplexMethylenetetrahydrofolate Reductase (NADPH2)CHO CellsCarrier StateProton Pump InhibitorsTransfectionSymportersgamma-Glutamyl HydrolaseGlucose Transporter Type 1CricetinaeMonosaccharide Transport ProteinsMonocarboxylic Acid TransportersSerotonin Plasma Membrane Transport ProteinsVitamin B 6Dopamine Plasma Membrane Transport ProteinsDrug CarriersNeural Tube DefectsVitamin B 12 DeficiencyMagnetic Resonance SpectroscopyExcitatory Amino Acid Transporter 2Excitatory Amino Acid Transporter 3Dietary SupplementsAmino Acid Transport System X-AGFormyltetrahydrofolatesMutationDietErythrocytesOrganic Cation Transporter 15-Methyltetrahydrofolate-Homocysteine S-MethyltransferaseExcitatory Amino Acid Transporter 14-Aminobenzoic AcidNorepinephrine Plasma Membrane Transport ProteinsCation Transport Proteins