Chorionic GonadotropinChorionic Gonadotropin, beta Subunit, HumanPituitary GlandGonadotropinsPituitary NeoplasmsPituitary Gland, AnteriorReceptors, LHGonadotropins, EquineReceptors, GonadotropinLuteinizing HormoneGonadotropins, PituitaryGlycoprotein Hormones, alpha SubunitFollicle Stimulating HormoneChoriocarcinomaGonadotropin-Releasing HormonePituitary DiseasesPituitary HormonesPregnancyOvulationOvaryProgesteroneLeydig CellsTrophoblastic NeoplasmsTestosteronePituitary Hormones, AnteriorProlactinPituitary ApoplexyEstradiolPregnancy TestsOvarian FollicleCorpus LuteumGranulosa CellsHydatidiform MoleLuteinizing Hormone, beta SubunitTestisPregnancy-Associated Plasma Protein-AReceptors, FSHOvulation InductionFollicle Stimulating Hormone, beta SubunitPregnancy Trimester, FirstPituitary Adenylate Cyclase-Activating PolypeptidePregnancy, EctopicUterine NeoplasmsHormones, EctopicEstriolPituitary Gland, PosteriorPituitary Hormone-Releasing HormonesReproductive Control AgentsPlacentaHypogonadismAdenomaHypophysectomyalpha-FetoproteinsSuperovulationGestational Trophoblastic DiseaseRadioimmunoassayInhibinsPlacental LactogenGrowth HormoneTrophoblastsGonadotrophsFertility Agents, FemaleReceptors, LHRHEstrusThyrotropinSexual MaturationAdrenocorticotropic HormonePituitary Function TestsHorsesMenotropinsRNA, MessengerProlactinomaInsemination, ArtificialHypopituitarismLuteinizationNuchal Translucency MeasurementTesticular NeoplasmsDown SyndromeTheca CellsFertilization in VitroSteroidsGrowth Hormone-Secreting Pituitary AdenomaLeydig Cell TumorPregnancy Tests, ImmunologicPituitary ACTH HypersecretionFluoroimmunoassayACTH-Secreting Pituitary AdenomaHormone AntagonistsThyrotropin-Releasing HormoneCastrationCyclic AMPLeuprolideHormonesAbortifacient Agents, NonsteroidalImmunoassayPerissodactylaHypothalamusCells, CulturedRats, Inbred StrainsPrenatal Diagnosis