Suprachiasmatic NucleusCircadian ClocksCircadian RhythmCLOCK ProteinsPeriod Circadian ProteinsBiological ClocksARNTL Transcription FactorsPhotoperiodCryptochromesLightDarknessChronobiology DisordersActivity CyclesMesocricetusFlavoproteinsCell NucleusVasoactive Intestinal PeptideMotor ActivityCircadian Rhythm Signaling Peptides and ProteinsGastrin-Releasing PeptidePineal GlandMelatoninNeuronsHypothalamusNuclear Receptor Subfamily 1, Group D, Member 1PeriodicityNuclear ProteinsReceptors, Vasoactive Intestinal Peptide, Type IIGene Expression RegulationPhotoreceptor Cells, InvertebrateBasic Helix-Loop-Helix Transcription FactorsTranscription FactorsNeuropeptidesParaventricular Hypothalamic NucleusFeedback, PhysiologicalLight Signal TransductionCell Cycle ProteinsReceptors, MelatoninJet Lag SyndromeRod OpsinsCricetinaeSupraoptic NucleusBehavior, AnimalDorsomedial Hypothalamic NucleusMice, Inbred C57BLProto-Oncogene Proteins c-fosCalbindinsRNA, MessengerHypothalamus, AnteriorIn Situ HybridizationOscillometry8-Hydroxy-2-(di-n-propylamino)tetralinRats, Sprague-DawleyTime FactorsArginine VasopressinDrosophila ProteinsS100 Calcium Binding Protein GEye ProteinsCasein Kinase IepsilonMetergolinePhotic StimulationMammalsTrans-ActivatorsFeeding BehaviorPhodopusMidline Thalamic NucleiLuciferasesVasopressinsRats, WistarArabidopsisLightingArabidopsis ProteinsRaphe NucleiPreoptic AreaAction PotentialsGene Expression Regulation, PlantMice, KnockoutBrainOptic NerveBody TemperatureModels, BiologicalImmunohistochemistrySerotonin Receptor AgonistsGastrointestinal HormonesMurinaeNeural PathwaysRetinaReceptors, G-Protein-CoupledOctodonArcuate NucleusSleepMutationGABA AntagonistsPituitary Adenylate Cyclase-Activating PolypeptideGene ExpressionSignal TransductionSynechococcusSerotoninFetal Tissue TransplantationLocomotion