Menstrual CycleFollicular PhaseLuteal PhaseCell CyclePremenstrual SyndromeFertile PeriodProgesteroneEstradiolGonadal Steroid HormonesAltitudeEstrogensMenstruationContraceptives, OralPremenopauseCell Cycle ProteinsSex CharacteristicsTime FactorsExerciseEndometriumG1 PhaseS PhaseOxygen ConsumptionMenstruation DisturbancesCell Cycle CheckpointsMitosisG2 PhaseCell DivisionEstrous CycleInterphaseCyclinsApoptosisOvulationLuteinizing HormoneFlow CytometryCell ProliferationPregnanediolDNA DamageDysmenorrheaCell Line, TumorFollicle Stimulating HormoneRetinoblastoma ProteinCell LineCDC2 Protein KinasePhosphorylationDNA ReplicationProtein-Serine-Threonine KinasesAmenorrheaRNA, MessengerEndometriosisOvulation DetectionCyclin-Dependent Kinase Inhibitor p21Cyclin D1OvaryCyclin-Dependent Kinase Inhibitor p27ImmunohistochemistryTumor Suppressor Protein p53DNA-Binding ProteinsCells, CulturedHormonesPregnancyCell NucleusG2 Phase Cell Cycle CheckpointsMenstrual Hygiene ProductsCyclin BHeLa CellsTumor Cells, CulturedBromodeoxyuridineDNACitric Acid CycleMolecular Sequence DataCell SurvivalGene Expression RegulationTumor Suppressor ProteinsNuclear ProteinsModels, BiologicalSignal TransductionAnovulationG0 PhaseInfertility, FemaleBlotting, WesternG1 Phase Cell Cycle Checkpoints