Human blastocyst

Human blastocyst

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Credit: ANDY WALKER, MIDLAND FERTILITY SERVICES/ SCIENCE PHOTO LIBRARY

Caption: Light micrograph of a human blastocyst, an early stage of embryonic development, photographed 4-5 days after fertilisation. The blastocyst consists of a hollow ball of cells with a localized thickening called the inner cell mass (bottom left), which ultimately develops into the actual embryo. The remainder of the blastocyst (the thin part of the ball ) is composed of trophoblast tissue. Analysis of trophoblast cells has provided a novel means of pre-natal screening for genetic disorders. Initially unattached, the blastocyst soon becomes implanted in the wall of the uterus.

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Keywords: 4-5 days old, black and white, black-and-white, blastocyst, embryo, human body, images, light micrograph, magnified image, microscopic photos, monochrome image, subjects

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