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  • Title: Circannual rhythms in the activity of the parathyroid gland and ultimobranchial body cells of the frog Rana temporaria (Anura, Amphibia).
    Author: Gevaerts H.
    Journal: Chronobiologia; 1991; 18(1):21-30. PubMed ID: 1935413.
    Abstract:
    The annual activity of the parathyroid gland cells and those of the ultimobranchial body cells of the frog Rana temporaria is quantitatively investigated by a morphometric study. A cosinor analysis shows a periodic succession of different parameters. The secretory activity of the parathyroid cells starts after a maximal value of external temperature in July. This activity is followed by an increase of plasma calcium which seems to induce the activity of the ultimobranchial cells.
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