title: Circadian rhythms in neonatal rat parotid gland acinar cell and ileal crypt cell mitosis.
abstract: Mitotic activity of parotid gland acinar cells and ileal crypt cells was analyzed over the course of a 26-hour period at 8 and 15 days after birth. At 8 days there is no detectable circadian rhythm of mitosis in either tissue while at 15 days after birth there is a mitotic rhythm with an amplitude of 36.8% in ileum and 26.5% in parotid gland. Possible factors which may influence and initiate circadian rhythms are discussed.
mesh_terms: D000375:Aging; D000818:Animals; D002940:Circadian Rhythm; D005260:Female; D007082:Ileum / Q000166:cytology / Q000254:growth & development / Q000502:physiology*; D008297:Male; D008938:Mitosis; D008940:Mitotic Index; D010306:Parotid Gland / Q000166:cytology / Q000254:growth & development / Q000502:physiology*; D051381:Rats