41.   In fact, most low-grade cervical precancers revert to normal cells.

42.   In most normal cells the gene is permanently switched off.

43.   In normal cells, the telomerase are shortened slightly each time the cell divides.

44.   In normal cells, the gene is firmly silenced.

45.   In tests on rodents, the drugs halted tumor growth without killing normal cells or causing toxic side effects.

46.   In the study reported in Science, scientists added the telomerase enzyme to normal human cells to see if they could override the cells natural degradation.

47.   In the mouse experiments, the drug seemed to halt cancer growth without harming normal cells, said Halperin.

48.   Instead, he and his colleagues are testing low-dose radiation to destroy the blood vessels but spare the normal retinal cells.

49.   It is known that normal cells run on a different timetable than cancerous cells.