11.   A vaccine developed by the French firm Pasteur Merieux Connaught consists of a canarypox virus genetically engineered to carry genes for two HIV proteins.

12.   But if both parents carry the gene, their children would have one chance in four of inheriting a copy from each parent and so getting the disease.

13.   But pigs carry a gene that is not present in humans.

14.   DNA carries genes that make proteins to correct any damage the DNA might suffer.

15.   Each virus is carrying a gene that makes the cancer cells susceptible to a drug circulating in the bloodstream.

16.   Everyone carries these genes, but a mutation in one of them can result in higher risks of breast, ovarian, prostate, colon and some other cancers.

17.   Everyone carries a gene for some affliction, very likely more than one.

18.   Fu is considered a genius in the tedious process of making viral vectors -- the transportation systems that carry engineered genes to their cellular destinations.

19.   Harley and Shay have already had some success engineering viruses to carry telomerase genes, instead of harmful viral genes, into cells.

20.   Hemophilia is caused by a recessive gene passed on to sons by a mother who carries the gene on one of her X chromosomes.