A region in the middle of the chromosome involved in cell division and the control of gene expression.
a specialized condensed region of a chromosomes that appears during mitosis where the chromatids are held together to form an X shape
a specialized condensed region of each chromosome that appears during mitosis where the chromatids are held together to form an X shape; "the centromere is difficult to sequence"
a specialized condensed region of each chromosome that appears during mitosis where the chromatids are held together to form an X shape