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The Journal of Cell Biology, Vol 48, 266-279, Copyright © 1971 by Rockefeller University Press

ARTICLE

INTRAMITOCHONDRIAL YOLK-CRYSTALS OF FROG OOCYTES : I. Formation of Yolk-Crystal Inclusions by Mitochondria during Bullfrog Oogenesis



William H. Massover 1

1 From the Whitman Laboratory, The University of Chicago, Chicago, Illinois 60637

Electron microscope examination of thin sections of bullfrog (Rana catesbeiana) ovarian oocytes has shown the presence of mitochondria containing yolk-crystal inclusions in oocytes of all sizes, from 160 to 1500 µ mean diameter. The hexagonally shaped yolk-crystals have major periodicities of 73.8 ± 10.7 A (n = 100). Several forms of modified mitochondria, observed in the smaller oocytes, may be arranged into a series of structurally intermediate forms between standard oocyte mitochondria and the typical mitochondria with yolk-crystal inclusions. The observation of such intermediate forms is consistent with proposals that the yolk-crystal inclusions arise within a limited portion of the oocyte chondriome by a complex process of mitochondrial differentiation.

Submitted on February 3, 1970
Revised on August 11, 1970


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