Location
Animal cells and cells of some microorganisms and lower plants contain two Centrioles located near the exterior surface of the nucleus. They are absent in higher plants.
Structure
In cross section each Centrioles consists of a cylindrical array of nine microtubules. However, each of the nine microtubules is further composed of tree tubules. The two Centrioles are usually placed at right angle to each other.
Functions
Just before a cell divides, its Centrioles duplicate and one pair migrates to the opposite side of the nucleus. The spindle then forms between them.
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