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. [ref]
Molecular Biology of the Cell, 4th edition by Bruce Alberts and others. Chapter 16, Microtubules and the Centrosome
New to topics? Read the docs here!