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Human blastocyst

Human blastocyst

P680/0207

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Credit

ANDY WALKER, MIDLAND FERTILITY SERVICES / SCIENCE PHOTO LIBRARY 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.

Release details

Model release not required. Property release not required.

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