Explanation:
During mitosis, many of the spindle fibers attach to chromosomes at their kinetochores.
Took a while before I found the answer though.
During prophase, the centrioles' spindle fibres connect to the chromatids' centromeres as they migrate to opposing ends of the cell.
Kinetochores are formed when spindle fibres attach to centrosomes. Kinetochores are where microtubules attach.
Centromeres are usually made up of quickly changing satellite DNA sequences, therefore centromeric DNA hasn't been well preserved over time. Many centromere/kinetochore proteins, on the other hand, are highly conserved, which is in line with the conserved centromeric function.
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