Mice, KnockoutUterusPhenotypeGene Knockout TechniquesMice, Inbred C57BLDisease Models, AnimalPregnancyMice, TransgenicEmbryo ImplantationGene DeletionGene TargetingRNA, MessengerUterine ContractionPregnancy, AnimalMyometriumSignal TransductionCells, CulturedMice, 129 StrainGene Expression RegulationImmunohistochemistryEstradiolCervix UteriEndometriumReverse Transcriptase Polymerase Chain ReactionUterine DiseasesOvariectomyProgesteroneLiverDeciduaBlotting, WesternBehavior, AnimalUterine NeoplasmsEmbryo, MammalianTime FactorsApolipoproteins EGene ExpressionBrainAnimals, Newborn