31.   Researchers say they have all but located a gene responsible for a heart-rhythm abnormality that can cause young, seemingly healthy people to drop dead without warning.

32.   Some strains are less sensitive to sweet taste than others, and scientists had found the approximate location of the responsible gene on a mouse chromosome.

33.   The gene responsible for the activity is FABI, Levy said.

34.   In the study, the pituitary glands of some mice were deprived of the gene responsible for the synthesis, making them unable to ovulate and therefore infertile.

35.   US researchers have identified a mutant gene responsible for a rare form of blindness that usually strikes children, according to a new study.

36.   Swedish researchers have discovered a gene responsible for the most common form of cancer, a skin cancer called basal cell carcinoma, Professor Rune Toftgaard said on Friday.

37.   The mice suffer from a type of obesity prompted by an anomaly in the gene responsible for the production of a leptin, a substance that controls appetite.