The cell center (centrosome). It is located in the cytoplasm close to the nucleus and is formed by two centrioles – cylinders located perpendicular to each other. The diameter of each centriole is 150–250 nm, and the length is 300–500 nm. The wall of each centriole consists of nine microtubule complexes, and each complex (or triplet), in turn, is built of three microtubules. Triplets of centrioles are interconnected by a number of ligaments. The main protein that forms centrioles is tubulin. Tubulin is transported to the area of the cell center via the cytoplasm. Here, cytoskeleton elements are assembled from this protein. Already assembled, they are sent to various parts of the cytoplasm, where they perform their functions.
Centrioles are also necessary for the formation of basal bodies of cilia and flagella. Before dividing the cells, the centrioles double. In the process of cell division, they diverge in pairs to the opposite poles of the cell and participate in the formation of dividing spindle filaments.
In the cells of higher plants, the cell center is arranged differently and does not contain centrioles
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