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Blastomere periphery of a 7-cell embryo

A low power TEM of a section of a blastomere of a stage 2, 7-cell embryo in vivo (original magnification x3,700). Dilated vesicles (V) of the smooth endoplasmic reticulum are located in the cortical area.

ZP, zona pellucida; *, subzonal space.

From: Pereda and Croxatto, 1992. Reproduced with permission of the Annals, Academy of Medicine, Singapore.

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Keywords: blastomere, cortical area, seven-cell embryo, stage 2 embryo, subzonal space, vesicles, zona pellucida

Source: The Virtual Human Embryo.