title: Circadian variation in the structure of mast cells.
abstract: Circadian variation in the structure of mast cells has been demonstrated histologically. At 11.00 h the number of mast cells was increased and at 03.00 h it was significantly decreased (p less than 0.01). Morphological analysis has also supported this phenomenon.
mesh_terms: D000818:Animals; D002940:Circadian Rhythm; D006634:Histamine H1 Antagonists / Q000494:pharmacology; D008297:Male; D008407:Mast Cells / Q000166:cytology* / Q000187:drug effects; D051379:Mice
chemical_list: D006634:Histamine H1 Antagonists