MyometriumPlacentaUterine ContractionPregnancyLabor, ObstetricUterusPlacenta DiseasesPlacenta AccretaLeiomyomaPlacenta PreviaPlacenta, RetainedUterine NeoplasmsPregnancy, AnimalTrophoblastsOxytocinLabor OnsetReceptors, OxytocinOxytocicsChorionic VilliEndometriumPregnancy ProteinsExtraembryonic MembranesMaternal-Fetal ExchangeParturitionGestational AgeDeciduaPlacentationTocolytic AgentsProgesteroneChorionFetusObstetric Labor, PrematureImmunohistochemistryEstradiolAmnionCesarean SectionPre-EclampsiaReverse Transcriptase Polymerase Chain ReactionRNA, MessengerSheepPregnancy Trimester, FirstRelaxinDinoprostPregnancy Trimester, ThirdHysterectomyUterine DiseasesMenstrual CycleGene ExpressionBlotting, WesternMyomaOvariectomyLeiomyomatosisPostpartum PeriodPlacental LactogenPlacental CirculationReceptors, ProstaglandinRioprostilGravidityChoriocarcinomaProstaglandins FBlotting, NorthernMuscle, SmoothFetal Growth RetardationReceptor, Galanin, Type 1Adrenergic beta-3 Receptor AgonistsHameliaReceptor, Galanin, Type 2