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The adenohypophysis of the flounder, Pleuronectes flesus, and the minnow, Phoxinus phoxinus

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Summary

The pituitary gland of the flounder, Pleuronectes flesus, showed several unusual cytological features. Between the RPD and the PPD was a zone of cells that stained purple with Alcian blue—PAS—orange G. Many of these cells were apparently degenerating. In the PPD the strands and coils of presumptive STH cells showed a tremendous variation in both size and staining properties. In the PI there were two cell types, the PAS-positive one bordering the neurohypophysis. Around the periphery of the PI was a zone of chromophobic cells, and throughout the PI were numerous intracellular and extracellular acidophil spheres.

No well defined ACTH cells were found in the RPD of the minnow (Phoxinus phoxinus). The Alcian blue—PAS—orange G technique distinguishes between blue TSH cells and purple GTH cells in the RPD and PPD. GTH cells from animals collected in the winter were vacuolated. The PI contained two cell types whose staining reactions and ultrastructure were extremely variable. Intra- and extra-cellular acidophil spheres were present.

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Authors and Affiliations

  1. Department of Zoology, University College of Wales, Aberystwyth, Wales

    Michael Benjamin

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I should like to thank Dr. T. Kerr of the Zoology Department, Leeds University, for his help and encouragement, and Mr. J. Dingley of the Department of Zoology, Aberystwyth, for collecting the flounders.

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Benjamin, M. The adenohypophysis of the flounder, Pleuronectes flesus, and the minnow, Phoxinus phoxinus . Cell Tissue Res. 157, 391–409 (1975). https://doi.org/10.1007/BF00225528

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