Blastula
From Free net encyclopedia
Image:Blastulation.png The blastula is an early stage of embryonic development in animals. It is also called blastosphere. It is produced by cleavage of a fertilized ovum and consists of a spherical layer of cells surrounding a fluid-filled cavity (blastocoel). The blastula follows the morula and precedes the gastrula in the development sequence. A blastula has around 128 cells, with a large central cavity called the blastocoel. A whitefish blastula is often used to help study the processes of mitosis in animal cells. The bastula is prevented from multiplying during the nuclearinjection stage.
In mammals blastulation leads to the formation of the blastocyst, which must not be confused with the blastula; even though they are similar in structure, their cells have different fates.
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