LM of a four-cell embryo showing its blastomeres

LM of a four-cell embryo showing its blastomeres

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Caption: Four-cell embryo. Image 3 of 4. Light micrograph of the cells (blastomeres) of a 4-cell human emb- ryo two days after in vitro fertilisation (IVF). In IVF, sperm is introduced to the egg in the laboratory. An envelope (zona pellucida) is seen around the embryo. 4-cell embryos are checked to ensure they are suitable for implantation into the uterus. Cytoplasmic fragments may be left around the cells (inside the zona pellucida) by cell divisions, which decreases the embryo's chances of survival. This embryo has a many fragments (small rounded areas) around it, and will be discarded. See images P680/488-491 for embryos with successi- vely more fragments. Magnification unknown.

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Keywords: 4-cell, 4-cell embryo, 4-cell stage, aborted, biological, biology, blastomere, development, developmental, embryo, embryogenesis, embryology, embryonic, four-cell, healthy, human body, human embryo, in vitro fertilisation, ivf, light micrograph, multicellular, no-one, nobody, normal, reproduction, zona pellucida

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