Coloured SEM of a hatching blastocyst 5 days old

Coloured SEM of a hatching blastocyst 5 days old

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This image is part of the feature First Week Of Life

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. It is seen at right hatching from a hole in the zona pellucida (at left), a protein shell that originally surrounded the unfertilised egg. The 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 has moved into the uterus (womb) and is preparing to implant on the womb wall. Magnification: x300 at 6x7cm size. Mag;x290 at original 6x7cm size.

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Keywords: 5 days, 5 days old, biological, biology, black background, blastocyst, coloured, development, developmental, embryo, embryogenesis, embryology, embryonic, false-coloured, hatching, healthy, human body, human embryo, images, magnified image, microscopic photos, multicellular, no-one, nobody, normal, reproduction, scanning electron micrograph, sem, subjects

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