In the cytoplasm, near nucleus, most of the animal cells and the cells of certain lower plants a centriole is a commonly present. The higher plants generally lack centriole. Each centrosome consists of two cylinders called centriol lying perpendicular to one another. Each cylinder is of about 0.2 micrometer in diameter, composed of nine parallel triplets of hollow cylindrical micro tubules. During cell division the centriole replicates and moves to opposite side of the cell and thread - like fibers begin to radiate from centriole in all directions cell Astral Rays.
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