1.   Telomeres are kept long in egg and sperm cells by the enzyme telomerase.

2.   The enzyme telomerase may play a role in lung cancer, according to a study in the Journal of the National Cancer Institute.

3.   They turn on the enzyme telomerase, and this makes the cell lines immortal.

4.   In laboratory experiments, the scientists prevented cancer cells from producing the enzyme telomerase, which helps the cells grow without limit.

5.   Working with laboratory cell cultures, researchers prevented cancer cells from producing the enzyme telomerase.