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Updated: April 30, 2025
His experiment of 1892 went farther still, for he succeeded in separating the first four segmentation-cells of the sea-urchin’s egg; and from each cell obtained a developing embryo.
As Hatschek afterwards found , the segmentation-cells only remain equal up to the morula-stage, the spherical body of which consists of thirty-two cells. Then, as always happens in unequal segmentation, the more sluggish vegetal cells are outstripped in the cleavage.
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