LM of human embryo at four-cell stage, after IVF

LM of human embryo at four-cell stage, after IVF

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Credit: PHILIPPE PLAILLY/SCIENCE PHOTO LIBRARY

Caption: Four-cell embryo. Light micrograph of an early, primitive stage of the human embryo, composed of only four cells. Each cell is called a blasto- mere. Granular cytoplasm can be seen inside the cells, and each has a central nucleus. Sperm with tails are visible around the embryo; these sperm were unsuccessful in reaching the egg in time to fertilise it. This embryo is a product of in vitro fertilisation (IVF), that is artificial fertilisation in the laboratory. At the four-cell stage the embryo has divided twice by mitosis, and must grow further before it can implant in the uterus.

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Keywords: 4-cell, 4-cell embryo, 4-cell stage, blastomere, embryo, human body, ivf, light micrograph

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