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Abortion, InducedAbortion, SpontaneousAbortion, VeterinaryAbortion, CriminalAbortion, TherapeuticAbortion ApplicantsAbortion, MissedAbortion, SepticAbortion, HabitualAbortion, ThreatenedEstradiolMifepristoneAbortifacient AgentsCorpus LuteumAbortion, IncompleteProgesterone CongenersAbortifacient Agents, SteroidalProgestinsEstrusAborted FetusUterusLuteinizing HormonePregnancyAbortion, EugenicOvariectomyLuteal PhasePregnancy, AnimalAbortifacient Agents, NonsteroidalEndometriumOvulationMisoprostolOvaryReceptors, EstrogenHormone AntagonistsPregnancy, UnplannedMenstrual CycleDinoprostEstrogensChorionic GonadotropinPregnancy, UnwantedHydroxyprogesteronesLuteal CellsFollicle Stimulating HormoneAdministration, IntravaginalPseudopregnancyPregnancy Trimester, FirstVacuum CurettageGonanesSheepGranulosa Cells20-alpha-DihydroprogesteroneFetal DeathGonadal Steroid HormonesGestational AgeOvarian FollicleCattleNorpregnadienesOviductsSteroidsEstrous CycleContraceptionFollicular PhasePregnant WomenLuteolysisBreast NeoplasmsCastrationSterilization, ReproductivePregnancy OutcomePregnenolone20-Hydroxysteroid DehydrogenasesEmbryo ImplantationMyometriumProlactinLegislation, MedicalOxytocinMinors3-Hydroxysteroid DehydrogenasesWomen's RightsRadioimmunoassayFamily Planning ServicesMenstruationPregnancy MaintenancePersonhoodAndrostenedionePlacentaDecidua5-alpha-DihydroprogesteroneGonadotropin-Releasing HormoneTestosteroneTime FactorsContraception BehaviorPregnancy TestsDiestrusReproductive RightsPregnancy Trimester, SecondProgesterone-Binding GlobulinMedroxyprogesteroneUterine HemorrhagePregnanoloneProgesterone Reductase