Circadian ClocksCLOCK ProteinsCircadian RhythmPeriod Circadian ProteinsARNTL Transcription FactorsBiological ClocksCryptochromesCircadian Rhythm Signaling Peptides and ProteinsPhotoperiodSuprachiasmatic NucleusNuclear Receptor Subfamily 1, Group D, Member 1FlavoproteinsHeteropteraLightBasic Helix-Loop-Helix Transcription FactorsPituitary Gland, IntermediateGene Expression RegulationTranscription FactorsNuclear ProteinsCell Cycle ProteinsTrans-ActivatorsArabidopsis ProteinsDarknessGene Expression Regulation, PlantArabidopsisChronobiology DisordersRNA, MessengerMotor ActivityFeedback, PhysiologicalPhotoreceptor Cells, InvertebrateE-Box ElementsCasein Kinase IepsilonMutationPineal GlandDrosophila ProteinsMice, Inbred C57BLTime FactorsJet Lag SyndromeMelatoninActivity CyclesGene Expression ProfilingMolecular Sequence DataReverse Transcriptase Polymerase Chain ReactionNeurospora crassaChronobiology PhenomenaSynechococcusSleep Disorders, Circadian RhythmCasein Kinase IdeltaPeriodicityOscillometryBegoniaceaeNuclear Receptor Subfamily 1, Group F, Member 1Light Signal TransductionMammalsModels, BiologicalDrosophilaAnimals, Genetically ModifiedDrosophila melanogasterNIH 3T3 CellsLuciferasesTranscription, GeneticBioterrorismDrug ChronotherapyLuminescenceGenes, PlantAnterior Horn CellsBehavior, AnimalGenes, InsectNeurosporaLactobacillus acidophilusFeeding BehaviorPromoter Regions, GeneticSleepInsect ProteinsArylalkylamine N-AcetyltransferaseHypocotylReceptors, G-Protein-CoupledGene ExpressionRod OpsinsMice, KnockoutDiapause, InsectDNA-Binding ProteinsSignal TransductionPhenotypeLiverPhytochromeReceptors, Vasoactive Intestinal Peptide, Type IINeuropeptidesFeedbackDefective VirusesMice, Mutant StrainsCyanobacteriaPhotobiologyLocomotionPlants, Genetically ModifiedPhytochrome BMesocricetusNeuronsLightingZebrafish