31.   Many cancer cells divide incessantly because their internal signaling systems have been thrown into hyper-drive by some genetic accident.

32.   Other researchers have recently made progress in understanding the cellular mechanism that limits the number of times a cell can divide.

33.   Perhaps because its cells divide frequently, the prostate is prone to malignancy.

34.   Researchers believe telomerase allows cancer cells to divide repeatedly by renewing telomerase, the end segments of chromosomes.

35.   Some studies have found that normal cells divide in the morning, while cancerous cells divide throughout the day.

36.   Telomeres get shorter each time a cell divides, so are shorter in the body cells of older animals.

37.   Telomeres, the tips of the chromosomes, get shorter each time a cell divides, so are shorter in the body cells of older animals.

38.   The cells divided normally and were unremarkable in every way other than their age, which the researchers attributed to the fountain of youth effects of the enzyme.

39.   The core of each chromosome is a long ribbon of DNA, which has to be duplicated each time a cell divides.

40.   The finding makes use of a newly discovered human gene which resets an inherent limit imposed by nature on the number of times a human cell can divide.