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Blastomere of an 8-cell embryo

TEM of a blastomere of a stage 2, 8-cell embryo in vitro (original magnification x7,000) 72 hours post-insemination. The cytoplasm contains mitochondria which are less dense than those in earlier embryos. The nucleus has clumps of heterochromatin and a reticular nucleolus.

G = juxtanuclear Golgi complex
M = mitochondria
V = vacuole

From: Sathananthan et al., 1982. Reproduced with permission of the publisher, Elsevier.

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Keywords: Golgi complex, blastomere, cytoplasm, eight-cell embryo, heterochromatin, mitochondria, reticular nucleolus, stage 2 embryo, vacuole(s)

Source: The Virtual Human Embryo.