title: A 'simple clock' approach of circadian rhythms: an easy way to predict the clock's singularity.
mesh_terms: D000818:Animals; D001683:Biological Clocks; D002940:Circadian Rhythm; D004175:Diptera / Q000502:physiology; D004330:Drosophila / Q000502:physiology; D008722:Methods; D011679:Pupa / Q000502:physiology