Y and X chromosome with telomeres

Y and X chromosome with telomeres

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Caption: Y and X chromosomes. Computer artwork of an Y (left) and a X (right) chromosome. The red regions mark out the telomeres, the ends of the chromosome. Telomeres consist of short repeated sequences of DNA and proteins, and are looped. The loop structure prevents the end of the chromosome being eroded by enzymes present in the cell nucleus and prevents enzymes from joining two chromosomes together. Telomeres play an important role in cellular aging. As cells replicate and age the telomere steadily shrinks. When the telomere reaches a certain length the cell stops dividing and dies.

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Keywords: chromatid, chromatids, chromosome, chromosomes, condensed, cut out, cut outs, cut-out, cut-outs, cutout, cutouts, deoxyribonucleic acid, dna, genetic, genetics, human chromosome, karyotype, male, male sex chromosomes, nucleotide, pair, pair 23, replication, sex chromosomes, telomer, telomerase, telomeres, x, xy, y

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