ARNTL Transcription Factors|Animals|Basic Helix-Loop-Helix Transcription Factors|CLOCK Proteins|Chromosome Mapping|Circadian Rhythm|Computer Simulation|Conserved Sequence|Drosophila Proteins|Drosophila melanogaster|Evolution, Molecular|Models, Genetic|Regulatory Sequences, Nucleic Acid|Sequence Analysis, DNA|Transcription Factors