= Centrosome
A microtubule-organizing structure in relevant <animal> <cells>. Positioning <centrosomes> relative to a niche can prepare the orientation of a later mitotic spindle. <Budding yeast> instead has a <spindle pole body>.
Its microtubule-nucleating material helps organize arrays without requiring every filament to remain permanently attached. A <centrosome> and a <centriole> are different structural levels: centrioles can be components of a <centrosome>, while the surrounding material carries much of the organizing activity. <Molecular Biology of the Cell, 4th edition by Bruce Alberts and others>[Chapter 16, Microtubules and the Centrosome]{ref}
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