PhotoperiodPhodopusHealth PromotionLightPeriodicitySeasonsMelatoninReproductionArvicolinaeSexual MaturationTestisPineal GlandPeromyscusFlowersCircadian RhythmProlactinOrgan SizeSeminal VesiclesLuteinizing HormoneDarknessSheepLightingTestosteroneMesocricetusCricetinaeEnvironment, ControlledEstrusFlorigenBody WeightGene Expression Regulation, PlantPhysiological ProcessesAcclimatizationTorporSexual Behavior, AnimalStarlingsFollicle Stimulating HormoneMarsupialiaAnestrusGonadsActivity CyclesArabidopsisTime FactorsGenes, PlantSparrowsMoltingTemperaturePortulacaceaePlant LeavesArabidopsis ProteinsGenitalia, MaleRodentiaBiological ClocksAntlersHypothalamusHoof and ClawOdonataPregnancyOvaryPlant ProteinsPituitary GlandTriturusSpermatogenesisSuprachiasmatic NucleusOvariectomyPlant StemsProgesteroneGibberellinsPhytochrome ACastrationCocarcinogenesisEstradiolCold TemperatureDrug ImplantsPhytochromeFood DeprivationOrchiectomyCryptochromesCheirogaleidaeLactation9,10-Dimethyl-1,2-benzanthraceneMotor ActivityPhytochrome BMacropodidaeHibernationFeeding BehaviorCarcinogensPapillomaAdaptation, PhysiologicalCarnivoraGoats