A telomere is a region of repetitive nucleotide sequences at the end of a chromosome, which protects the end of the chromosome from deterioration or from fusion with neighboring chromosomes.Telomere regions deter the degradation of genes near the ends of chromosomes by allowing chromosome ends to shorten, which necessarily occurs during chromosome replication. Over time, due to each cell division, the telomere ends become shorter. (from medical school tumblr)
Large image at nerd-alert.net (link). FISH detection of telomeres in metaphase human chromosomes (obtained from a lymphocyte), using a telomeric DNA probe. In this image, the telomeres light up yellow, whereas the rest of the chromosome is shown in blue.
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