Oocyte nucleus. The nuclei of oocytes have many nucleoli that tend to be located near the nuclear envelope. A Balbiani body, which is a large mass of mitochondria, is located close to the nucleus. Within the cytoplasm are many small membrane-bound structure called yolk platelets, which provide nutrition for the developing embryo. Image from AF Wiechmann and CR Wirsig (2003) "Color Atlas of Xenopus laevis Histology", (page 78, Chapter 8, Reproductive Organs: Figure 3). Copyright 2003. Kluwer Academic Publishers. Reproduced with kind permission from Springer Science & Business Media B.V.
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