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The pineal and melatonin: Regulators of circadian function in lower vertebrates

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Summary

The pineal has been identified as a major circadian pacemaker within the circadian system of a number of lower vertebrates although other pacemaking sites have been implicated as well. The rhythmic synthesis and secretion of the pineal hormone, melatonin, is suggested as the mechanism by which the pineal controls circadian oscillators located elsewhere. Both light and temperature cycles can entrain the pineal melatonin rhythm. The pineal, therefore, acts as a photo and thermoendocrine transducer which functions to synchronize internal cycle with cycles in the environment. A model is presented which portrays the pineal as a major component of a ‘multioscillator’ circadian system and which suggests how these multiple circadian clocks are coupled to each other and to cycles of light and temperature in the external world.

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  1. Department of Zoology, North Carolina State University, 27695, Raleigh, North Carolina, USA

    H. Underwood

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Underwood, H. The pineal and melatonin: Regulators of circadian function in lower vertebrates. Experientia 45, 914–922 (1989). https://doi.org/10.1007/BF01953048

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