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Biology of Reproduction, Vol 22, 357-365, Copyright © 1980 by Society for the Study of Reproduction

Electron Microscopic Localization of Binucleate Cells in the Sheep Placenta Using Phosphotungstic Acid

F. B.P. WOODING 1

1 Agricultural Research Council Institute of Animal Physiology, Babraham, Cambridge CB2 4AT, England


Phosphotungstic acid (PTA) under certain conditions produces an extremely selective high density staining of the microvillar junction and the granules of binucleate cells, but few other components in the sheep placenta. Granules similar in staining properties are also found in the syncytial layer. At all stages examined (Days 29-142) of normal pregnancy, a significant number of binucleate cells are found interrupting the microvillar junction staining, some deeply indenting the syncytium. The PTA staining emphasizes the similarity between binucleate cell and syncytial nuclei and their difference from the rest of the nuclei. The possible normal formation of syncytium from binucleate cells is briefly discussed.

Submitted on March 15, 1979
Accepted on October 18, 1979




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[Abstract] [Full Text]


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Copyright © 1980 by the Society for the Study of Reproduction.