Proton-Coupled Folate TransporterReduced Folate Carrier ProteinFolate Receptor 1Folic AcidFolic Acid TransportersProtonsFolate Receptors, GPI-AnchoredFolic Acid AntagonistsMembrane Transport ProteinsMalabsorption SyndromesTetrahydrofolatesAminopterinFolic Acid DeficiencyFolate Receptor 2Biological TransportUricosuric AgentsProton PumpsMethotrexateAnion Transport ProteinsCarrier ProteinsATP-Binding Cassette TransportersHydrogen-Ion ConcentrationGlutamatesHeLa CellsIntestinal AbsorptionOrganic Anion TransportersMolecular Sequence DataReceptors, Cell SurfaceGuanineAmino Acid SequenceKineticsCHO CellsProton Pump InhibitorsVitamin B 12TransfectionGlucose Transporter Type 1SymportersHomocysteineMonosaccharide Transport ProteinsCricetinaeMonocarboxylic Acid TransportersSerotonin Plasma Membrane Transport ProteinsDopamine Plasma Membrane Transport ProteinsExcitatory Amino Acid Transporter 2Pteroylpolyglutamic AcidsExcitatory Amino Acid Transporter 3Magnetic Resonance SpectroscopyAmino Acid Transport System X-AGVitamin B ComplexOrganic Cation Transporter 1Excitatory Amino Acid Transporter 1Methylenetetrahydrofolate Reductase (NADPH2)Norepinephrine Plasma Membrane Transport Proteins