The arrangement of microtubules in a centriol | vedclass

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(A) Centrioles are cylindrical structures composed mainly of the protein tubulin. Each centriole is made up of $9$ evenly spaced peripheral fibrils of

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$9+0$

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(A) Centrioles are cylindrical structures composed mainly of the protein tubulin. Each centriole is made up of $9$ evenly spaced peripheral fibrils of tubulin protein. Each of the peripheral fibrils is a triplet. The adjacent triplets are linked to each other. The central part of the proximal region of the centriole is also proteinaceous and is called the hub,from which radial spokes made of protein extend and connect to the triplets. The centriole does not have any central microtubules. Therefore,the arrangement of microtubules in a centriole is referred to as the $9+0$ arrangement.

The arrangement of microtubules in a centriole is described as $...........$.

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