31.   For example, could researchers devise ways to add just the DNA of an adult cell, without fusing two living cells?

32.   For several decades, researchers have tried to find a source of living cells to coax into new tissues.

33.   Further research allowed her to discriminate between types of living cells, which allowed identification of different microbes.

34.   He decided to study not DNA but the less popular RNA, a chemical relative now known to play many different roles in living cells.

35.   He has found two families of genes that are involved in relaying messages about sugar metabolism to the information center in the nucleus of living cells.

36.   He tried to learn how the basic building blocks of life could have been synthesized outside a living cell.

37.   If researchers can alter living cells by adding new genes, then the cells could be sent into the body to carry out specific biological tasks.

38.   In a living cell, the folding process is helped along by auxiliary molecules called chaperones.

39.   In an effort to discern sub-microscopic proteins in living cells, scientists have created a series of biochemical tricks to extend the range of optical microscopes.

40.   In the right conditions, DNA can survive for many years after the death of the living cells that make it.