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Model systems implementing various approaches to immortalize cells have led toward further understanding of replicative senescence and carcinogenesis. Human diploid cells have a limited life span, termed replicative senescence. Because cells are terminally growth arrested during replicative...
Multiple pathways are involved in accurate synthesis and distribution of DNA during replication, repair and maintenance of genomic integrity. An increased error rate, abovethe spontaneous mutation baseline, has been implicated in carcinogenesis and aging. Moreover, cytogenetic abnormalities are...
p21 WAF1/CIP1/SDI1 was originally described as a protein expressed at high levels in senescent human fibroblasts. We have studied the expression of p21 in adrenocortical cells, p21 is not expressed under most circumstances in the intact adrenal gland in vivo , except when the gland is damaged....
Genetic recombination is the creation of new gene combinations in a cell or gamete, which differ from those of progenitor cells or parental gametes. In eukaryotes, recombination may occur at mitosis or meiosis. Mitotic recombination plays an indispensable role in DNA repair, which presumably...
Telomeres lie at the ends of human chromosomes and contain long tandem repeats of a simple nucleotide sequence. Because DNA replication cannot proceed to the very end of chromosomes, copies of these repeats are lost at each cell division. If the telomeres shorten below a critical length, the...
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