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A centriole in biology is a hollow cylindrical organelle found in most animal cells, and cells of fungi and
algae. The walls of centrioles are composed of nine triplets of microtubules, each arranged at a right angle (so when looking down the tube, one end
of the triplet pair points slightly out and the other end points slightly inwards). In cells, they are usually found in pairs at
a right-angle to each other, forming a centrosome. Centrioles are important in
the cell division process, organising the spindle upon which the chromosomes are pulled apart. Some animal
cells may be able to separate without centrioles. Centrioles assist the cell through the process of mitosis.
Centrioles are not autonomous organelles, as is explained here: Medical Engineer -
Centrioles are not Autonomous
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