Mice, KnockoutPhenotypeGene Knockout TechniquesMice, Inbred C57BLTechnologyBiomedical TechnologyDisease Models, AnimalGene TargetingTechnology Assessment, BiomedicalMice, TransgenicTechnology TransferGene DeletionSignal TransductionMice, 129 StrainCells, CulturedRNA, MessengerGene Expression RegulationReverse Transcriptase Polymerase Chain ReactionBehavior, AnimalMedical Laboratory ScienceLiverEducational TechnologyBrainGene Expression ProfilingTime FactorsApolipoproteins EMutationImmunohistochemistryNeuronsBlotting, Western