False-colour TEM of 6-day-old fertilised ovum

False-colour TEM of 6-day-old fertilised ovum

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Credit: CNRI/SCIENCE PHOTO LIBRARY

Caption: False-colour transmission electron micrograph (TEM) of the human morula - a fertilised ovum - 6 days after fertilisation. The morula is an early stage of embryonic development; it is formed by successive cleavage of cells in the fertilised ovum. It consists of a solid ball of cells & may be considered as an intermediate stage between the zygote, the fertilised ovum before the advent of cleavage, & the blastocyst, the hollow ball of cells with an inner mass that attaches itself to the wall of the uterus. The ring of material (pink) around the edge of the morula is debris of sperm that failed to penetrate & fertilise the ovum. Magnification: x35 at 35mm size.

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Keywords: false-coloured, human body, morula

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