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Unformatted text preview: telomeres. It's the telomere region that gets shorter with each DNA replication. Most cells can divide about 30 times before they run out of telomeres and can no longer replicate DNA without losing codable genes. Telomere Ends of Chromosomes Mouse Telomeres (Orange Tips) Some tissues have telomerases, special enzymes that catalyze new telomere code to chromosomes. In humans, telomerases are normally found only in tissues that produce gametes, but that ensures that gamete chromosomes have long telomeres. Shortening telomeres in tissues may be a factor in aging and lifespan. Regrettably telomerases seem to be abundant in some cancer cells, so that rapid reproduction does not result in shortening of telomeres and cell death from lack of needed genes....
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- Spring '10