Animal Use AlternativesDuodenoscopyCrohn DiseaseDisease Models, AnimalAlzheimer DiseaseModels, AnimalAmyloid beta-PeptidesAmyloid beta-Protein Precursortau ProteinsBrainNeurofibrillary TanglesPlaque, AmyloidPresenilin-1Apolipoprotein E4Mice, TransgenicNeurofibrilsDementiaNeurodegenerative DiseasesAmyloid Precursor Protein SecretasesMice, Inbred C57BLAmyloidNeuronsPeptide FragmentsCognition DisordersHuntington DiseaseAtrophyNeuropsychological TestsDementia, VascularParkinson DiseaseNerve DegenerationApolipoproteins EMild Cognitive ImpairmentHippocampusNeuroprotective AgentsMice, KnockoutAgingPresenilin-2Nerve Tissue ProteinsModels, BiologicalMagnetic Resonance ImagingGenetic Predisposition to DiseaseDisease ProgressionCerebral CortexModels, GeneticMutation