Coloured SEM of blastocyst embryo hatching

Coloured SEM of blastocyst embryo hatching

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Credit: DR YORGOS NIKAS/SCIENCE PHOTO LIBRARY

Caption: Hatching blastocyst embryo. Coloured scanning electron micrograph (SEM) of a human embryo at the blastocyst stage, five days after fertilisation. The embryo (blue) is hatching from the zona pellucida (green), a protein shell that originally surrounded the unfertilised egg. Sperm tails (red) are also visible. A blastocyst is a hollow ball of cells with a fluid centre. Each cell is called a blastomere. Most of these embryo cells will form the placenta and membranes around the embryo, and only a small group (the inner mass) form the embryo proper. At this stage the blastocyst is preparing to implant on the wall of the uterus (womb). Magnification: x1030 at 5x7cm size. Magnification: x3700 at 10x6.5 " size.

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Keywords: 5 days, 5 days old, blastocyst, embryo, hatching, human body, sperm, tail, zona pellucida

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