DuodenoscopyCrohn DiseaseAlzheimer DiseaseAmyloid beta-PeptidesModels, AnimalDisease Models, AnimalAmyloid beta-Protein Precursortau ProteinsNeurofibrillary TanglesBrainPlaque, AmyloidApolipoprotein E4NeurofibrilsDementiaAmyloid Precursor Protein SecretasesPresenilin-1Cognition DisordersAmyloidAtrophyNeuropsychological TestsDementia, VascularMice, TransgenicApolipoproteins EPeptide FragmentsMild Cognitive ImpairmentHippocampusAgingNeuronsPresenilin-2Magnetic Resonance ImagingCognitionAspartic Acid EndopeptidasesMental Status ScheduleLewy Body DiseaseCholinesterase InhibitorsAge of OnsetNerve DegenerationCerebral CortexBrain ChemistryMemantineMemory DisordersMice, Inbred C57BLAniline CompoundsPresenilinsDisease ProgressionNeurodegenerative DiseasesCerebral Amyloid AngiopathyNational Institute on Aging (U.S.)Biological MarkersAutopsyProtease NexinsSubstantia InnominataLongitudinal StudiesRats, Sprague-DawleyTauopathiesNerve Tissue ProteinsDown SyndromePositron-Emission TomographyImmunohistochemistryTime FactorsGenetic Predisposition to DiseaseThiazolesMutationPhenylcarbamatesParkinson DiseaseAmyloidogenic ProteinsIndansGenotypeMolecular Sequence DataNootropic AgentsModels, Biological