The structure that organizes the protein subunits of the mitotic spindle is the:

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The centrosome is the organelle that organizes the protein subunits of the mitotic spindle. It contains two centrioles that serve as the starting point for spindle formation. Centromeres are regions of DNA on chromosomes where the spindle fibers attach during cell division, while kinetochores are protein structures on centromeres that attach to spindle fibers. Cytoskeleton and microfilaments are involved in cell shape and movement but not specifically in organizing the mitotic spindle.

The Structure That Organizes the Protein Subunits of the Mitotic