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Some view this mechanism as a natural "time clock" of the cell, allowing a finite number of cellular replications, also called the Hayflick limit of a cell.
By maintaining sequences of 5'-TTAGGG-3' on the ends of chromosomes telomerase keeps cells resistant to aging and unaffected by the restrictions imposed on them by the Hayflick limit.
36) At this point (called the Hayflick limit after the scientist who discovered it) the cell enters a senescent state.