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The European Society of Human Reproduction and Embryology (ESHRE) PGS Task Force has now shown, in its groundbreaking proof of principle study, that screening of polar bodies (small cells that are the by-product of egg development), is a reliable method to analyse the chromosomal status of an egg.
They could identify the chromosomal status of the eggs in 89 % of all polar bodies analysed, Prof.
Cleavage began after discharge of the polar bodies, the first and second one being along the vertical axis of the egg (stages 4&5) and the third in the horizontal plane just above the axis (Fig.