This term is obsolete.
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Definition:
The region of a condensed nuclear chromosome that includes the centromere and associated proteins, including the kinetochore. In monocentric chromosomes, this region corresponds to a single area of the chromosome, whereas in holocentric chromosomes, it is evenly distributed along the chromosome.
Comment:
Note that this term can be used in place of the obsolete cellular component term 'centromere ; GO:0005698'. Use with caution because this term refers to a specific region of the chromosome and not a protein complex.