Period Circadian ProteinsCLOCK ProteinsARNTL Transcription FactorsCircadian RhythmRNA, MessengerTranscription, GeneticBase SequenceMolecular Sequence DataAmino Acid SequenceAlternative SplicingGene Expression ProfilingCloning, MolecularDNA, ComplementaryReverse Transcriptase Polymerase Chain ReactionBlotting, NorthernExonsGene Expression RegulationRNARNA SplicingGene ExpressionRNA, Antisense