Provide your best answer for the following question. Give ONLY the answer, no other words or explanation.
For example:

Answer: <most likely answer, as short as possible; not a complete sentence, just the answer!>.

The question is: What role does the centromere play in cellular reproduction?
It is the area of attachment for chromatids.
The centromere is the site of spindle fiber attachment during mitosis and meiosis, ensuring proper chromosome segregation.