title: Is there an intrinsic period of the circadian clock? Response.
authors.affiliation: Circadian, Neuroendocrine, and Sleep Disorders Section, Division of Endocrinology, Department of Medicine, Harvard Medical School, Brigham and Women's Hospital, Boston, MA 02115, USA.
authors.forename: C A
authors.initials: CA
authors.lastname: Czeisler
authors.forename: D J
authors.initials: DJ
authors.lastname: Dijk
authors.forename: R E
authors.initials: RE
authors.lastname: Kronauer
authors.forename: E N
authors.initials: EN
authors.lastname: Brown
authors.forename: J F
authors.initials: JF
authors.lastname: Duffy
authors.forename: J S
authors.initials: JS
authors.lastname: Allan
authors.forename: T L
authors.initials: TL
authors.lastname: Shanahan
authors.forename: D W
authors.initials: DW
authors.lastname: Rimmer
authors.forename: J M
authors.initials: JM
authors.lastname: Ronda
authors.forename: J F
authors.initials: JF
authors.lastname: Mitchell
authors.forename: E J
authors.initials: EJ
authors.lastname: Silva
authors.forename: J S
authors.initials: JS
authors.lastname: Emens
mesh_terms: D000818:Animals; D001683:Biological Clocks / Q000235:genetics / Q000502:physiology*; D002909:Chronobiology Phenomena; D002940:Circadian Rhythm / Q000235:genetics / Q000502:physiology*; D003624:Darkness; D006801:Humans; D012890:Sleep