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The specialized chromatin located in the centromeric core region or the entire centromeric region in organisms with point centromeres, which is enriched for CENP-A-containing nucleosomes. This chromatin forms a 3-dimensional structure which provides a platform for kinetochore assembly and microtubule attachment. [GOC:vw, PMID:20206496, PMID:22729156, PMID:24710126]
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