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Distribution of monoamine oxidase and acetylcholinesterase in the hypothalamo-hypophysial system of the lamprey, Lampetra japonica

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Summary

Histochemical distributions of monoamine oxidase (MAO) and acetylcholinesterase (AChE) were studied in the hypothalamo-hypophysial system of the lamprey. The anterior part of the neurohypophysis which lies parallel to the pars distalis was strongly MAO positive. The posterior part of the neurohypophysis which is contiguous to the pars intermedia showed relatively weak activity of MAO. Considering differences in enzyme concentrations together with other anatomical characteristics, the possibility that the anterior neurohyp physis of the lamprey could be comparable to the tetrapod median eminence and the posterior neurohypophysis comparable to the pars nervosa is discussed. The activity of AChE was not detected in the hypothalamo-hypophysial neurosecretory system.

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Authors and Affiliations

  1. Misaki Marine Biological Station, University of Tokyo, Miura, Kanagawa-ken, Japan

    Kazuhiko Tsuneki

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  1. Kazuhiko Tsuneki
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The author is indebted to Professor H. Kobayashi for the guidance of this study. He also appreciates Professor C. D. Turner for the kind reading of the manuscript. This study was partly supported by a grant #5R040 from Japan Society for Promotion of Science and a grant from Ministry of Education of Japan.

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Tsuneki, K. Distribution of monoamine oxidase and acetylcholinesterase in the hypothalamo-hypophysial system of the lamprey, Lampetra japonica . Cell Tissue Res. 154, 17–27 (1974). https://doi.org/10.1007/BF00221068

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  • DOI: https://doi.org/10.1007/BF00221068

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