title: Circadian timekeeping in health and disease. Part 1. Basic properties of circadian pacemakers.
mesh_terms: D000818:Animals; D001831:Body Temperature; D002940:Circadian Rhythm / Q000187:drug effects; D003624:Darkness; D004777:Environment; D013006:Growth Hormone / Q000097:blood; D006801:Humans; D006854:Hydrocortisone / Q000097:blood; D008027:Light; D051379:Mice; D009900:Optic Nerve / Q000502:physiology; D011188:Potassium / Q000652:urine; D051381:Rats; D012890:Sleep / Q000502:physiology; D013493:Suprachiasmatic Nucleus / Q000502:physiology*
chemical_list: D013006:Growth Hormone; D011188:Potassium; D006854:Hydrocortisone