Mice, KnockoutPhenotypeGene Knockout TechniquesMice, Inbred C57BLDisease Models, AnimalMice, TransgenicGene DeletionGene TargetingMice, 129 StrainSignal TransductionCells, CulturedRNA, MessengerGene Expression RegulationBehavior, AnimalLiverApolipoproteins EReverse Transcriptase Polymerase Chain Reaction