High power TEM of a section of a blastomere of a stage 2, 16-cell embryo in vivo (original magnification x30,000). Crystalline inclusions (Cr) are present throughout the cytoplasm of the blastomeres.
From: Pereda and Croxatto, 1992. Reproduced with permission of the Annals, Academy of Medicine, Singapore.
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Source: The Virtual Human Embryo.