Coloured SEM of human embryo at the 2-cell stage

Coloured SEM of human embryo at the 2-cell stage

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This image is part of the feature First Week Of Life

Credit: DR YORGOS NIKAS/SCIENCE PHOTO LIBRARY

Caption: Two-cell embryo. Coloured scanning electron micrograph (SEM) of a human embryo at the two cell stage, about 30 hours after fertilisation. Still to form into a morula, a cluster of cells, each large rounded cell here is called a blastomere. The smaller spherical structure (at lower centre) is a polar body which will degenerate. The surface of each cell is covered in microvilli. This embryo has only undergone one cell division. The cells will continue to divide and eventually will transform into a human foetus composed of millions of cells. At this two-celled stage, the embryo has not yet implanted in the uterus (womb). Magnification: x830 at 6x7cm size. mag x 625 at original 6x7cm.

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Keywords: 2-cell, 2-cell stage, biological, biology, black background, blastomere, coloured, development, developmental, embryo, embryogenesis, embryology, embryonic, false-coloured, healthy, human body, human embryo, images, magnified image, microscopic photos, no-one, nobody, normal, polar body, reproduction, scanning electron micrograph, sem, subjects

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