21.   Adults who have certain mutant genes are far less likely to develop a form of leukemia than those with normal genes, according to new research published today.

22.   And what causes the normal gene to go haywire and result in cancer?

23.   Doctors took the stem cells and added a normal ADA gene that had been transferred into a virus.

24.   Gene therapy attempts to repair or replace broken genes in seriously ill patients by transferring normal genes into the body.

25.   Mice with the normal gene gained weight on the high-fat diet.

26.   The goal of gene therapy is to get the body to produce the protein by putting normal genes back into the patient.

27.   The hereditary cases appear in women who inherit a flawed version of the gene, which fails to suppress the development of cancer as the normal gene does.

28.   The normal gene is on two chromosomes of the fruit fly.

29.   The sickle cell trait is not considered a disease, but a hereditary condition in which a person has one normal gene and one abnormal gene in the blood.

30.   The virus infected the bone marrow, carrying the normal gene into each of the blood-making cells.