title: Is there an intrinsic period of the circadian clock?
authors.forename: S
authors.initials: S
authors.lastname: Campbell
mesh_terms: D000818:Animals; D001683:Biological Clocks / Q000502:physiology*; D001831:Body Temperature; D002940:Circadian Rhythm / Q000502:physiology*; D003624:Darkness; D006801:Humans