The centromere and telomeres contain repetitive
DNA sequences. They are evolutionarily
conserved because they are important for chromosome
stability. The segments located between
the telomeres and centromere consist of
trypsin-sensitive light and trypsin-resistant
dark G-bands. The light G-band areas of DNA
form loops in which the protein-coding genes
lie. The DNA loops are bound to a protein matrix
at special attachment sites.
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