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. 2020 May 13;17(10):3384. doi: 10.3390/ijerph17103384

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Ultrastructure of IVF-5% blastocyst. A. TEM micrograph of a TE cell with a large nucleus (N). (TEM. Bar: 1 μm). B. Intercellular junction (arrow) between TE cells (TEM. Bar: 0.6 μm). C. TEM micrograph showing mitochondria (m) with evident cristae (TEM. Bar: 0.1 μm). D. High magnification of a multi-vesicular body (mvb) (TEM. Bar: 0.6 μm). E. Ultrastructure of ICM cells showing ovoid nuclei (N) with patches of heterochromatin (Hc). The inner cell shows numerous vacuoles (V). The arrow indicates the intercellular contacts (TEM. Bar: 1 μm). F. ICM blastomere with evident chromosomes (Ch) (TEM. Bar: 1 μm). G. ICM cells with the presence of vacuolated mitochondria (vm) and residual bodies (Rb) (TEM. Bar: 0.8 μm). N: nucleus; nm: nuclear membrane; m: mitochondria; vm: vacuolated mitochondria; mv: microvilli; Hc: heterochromatin; Eu: euchromatin; Gl: glycogen granules; mvb: multivesicular body; ZP: zona pellucida; V: vacuoles; Rb: residual bodies.