Circadian rhythm in the pineal organ of the yellow-bellied toad, Bombina variegata (L.), under laboratory conditions.
A circadian morphological rhythm of the pineal organ, as judged by changes in the nuclear volume of the photoreceptor cells, was found in sexually mature male Yellow-bellied toads (Bombina variegata) maintained continuously at 26 degrees C and on a 17L/7D illumination cycle. The greatest nuclear volume occurred at the photophase (16.00 h), and the lowest at the end of the scotophase (4.00 h).
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Department of Embryology and Medical Genetics, Nicolaus Copernicus University School of Medicine, Kraków, Poland.
D000818:Animals; D001001:Anura / Q000502:physiology*; D002467:Cell Nucleus / Q000648:ultrastructure; D002940:Circadian Rhythm; D008297:Male; D010870:Pineal Gland / Q000502:physiology* / Q000648:ultrastructure