21.   A knowledge of how such communication goes on in normal cells is necessary to understand what goes awry in cancerous cells, Blobel said.

22.   Additionally, said Veronesi, fenretinide forces cells that are becoming dangerously immortal to go through normal cell death, or apoptosis.

23.   But it hits normal cells as well, producing often-vicious side effects.

24.   But the telomerase gene is suppressed in most normal cells, and as people age, their telomeres decrease.

25.   But the biopsy finds only normal cells.

26.   By focusing on those processes, drug companies began working on drugs aimed to kill cancer cells without harming normal cells.

27.   Cancer researchers readily confess that they do not know why cancer cells are more susceptible to these poisons than normal cells.

28.   Cell murder is different from normal cell death.

29.   Changes in the DNA structure can have profound effects on the way in which genes and their products carry out the duties of maintaining normal cell activities.

30.   Conceivably he could receive another transplant of his own marrow after treatment with blood cell growth factors designed to produce enough normal cells for transplantation.