Proton-Coupled Folate TransporterFolate Receptor 1Malabsorption SyndromesReduced Folate Carrier ProteinFolic Acid TransportersFolic Acid AntagonistsFolic AcidMembrane Transport ProteinsTetrahydrofolatesFolate Receptors, GPI-AnchoredNuclear Respiratory Factor 1PancytopeniaFolic Acid DeficiencyMetabolism, Inborn ErrorsIntestinal AbsorptionHeLa CellsConsanguinityProtonsHydrogen-Ion ConcentrationGlutamatesGuanineBiological TransportMethotrexatePyrimidinesMutagenesis, Site-DirectedMolecular Sequence DataAmino Acid Sequence