AllelesGenotypeHeterozygoteGene FrequencyPolymorphism, GeneticHomozygotePolymorphism, Single NucleotideGenetic Predisposition to DiseaseHaplotypesCase-Control StudiesMethylenetetrahydrofolate Reductase (NADPH2)Polymerase Chain ReactionEuropean Continental Ancestry GroupMutationRisk FactorsAsian Continental Ancestry GroupGenetic VariationPhenotypeAfrican Continental Ancestry GroupPolymorphism, Restriction Fragment LengthMolecular Sequence DataAfrican AmericansLinkage DisequilibriumBase SequenceGenetic MarkersSequence Analysis, DNAModels, GeneticChromosome MappingMicrosatellite RepeatsChinaEthnic GroupsGenetics, PopulationSomatoform DisordersJapanExonsCohort StudiesDNA Mutational AnalysisCrosses, GeneticPedigreeDNA PrimersGenetic LinkagePhylogenyHLA-DRB1 ChainsGenome-Wide Association StudyOdds RatioAmino Acid SequenceGenetic LociHLA-DQ AntigensDNAAryl Hydrocarbon HydroxylasesSelection, GeneticMinisatellite RepeatsPoint MutationTime FactorsPromoter Regions, GeneticPrevalenceRecombination, GeneticHLA-DR AntigensContinental Population GroupsCytochrome P-450 CYP2D6KoreaMutation, MissenseUnited StatesIntronsGene DeletionHeterozygote DetectionGenetic TestingSex FactorsDiabetes Mellitus, Type 2Hispanic AmericansGlutathione TransferaseApolipoproteins EHLA-B AntigensReference ValuesApoprotein(a)Apolipoprotein E4Genotyping TechniquesCholera VaccinesAsiaAge FactorsAge of OnsetHawaiiIndiaPeptidyl-Dipeptidase AProspective StudiesCatechol O-MethyltransferaseGenes, DominantChi-Square DistributionSmokingHLA-DQ alpha-ChainsSex CharacteristicsAsian AmericansHLA AntigensRiskLogistic ModelsPharmacogeneticsGenes, RecessiveQuantitative Trait LociGenes, LethalSpecies Specificity