Centrioles are present within the centrosomes of animal cells, as well as in the cells of some fungi, in green algae, and in such plants as liverworts, mosses, hornworts, and ferns (seed plants, however, lack them). They are cylindrical structures, made up of nine triplet microtubules each (see figures right), and are present as pairs within each centrosome, where they stand at right angles to each other, forming a T-shape. They replicate at the same time as the centrosome and serve as a center for the assembly of the spindle apparatus during cell division.
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