A 24-hour circadian clock is found in the mammalian retina.
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D000818:Animals; D001683:Biological Clocks; D002940:Circadian Rhythm; D006224:Cricetinae; D046508:Culture Techniques; D006801:Humans; D008550:Melatonin / Q000096:biosynthesis*; D008647:Mesocricetus; D012160:Retina / Q000378:metabolism / Q000502:physiology*; D013493:Suprachiasmatic Nucleus / Q000502:physiology
D008550:Melatonin