title: On the nature of Biological Clocks?
mesh_terms: D000255:Adenosine Triphosphate / Q000378:metabolism; D000818:Animals; D001683:Biological Clocks; D001921:Brain / Q000378:metabolism; D006224:Cricetinae; D008099:Liver / Q000378:metabolism; D012890:Sleep
chemical_list: D000255:Adenosine Triphosphate