31.   In the earlier study, they identified the gene that causes Stargardt disease, a severe form of macular degeneration that usually develops in childhood.

32.   In those few cases in which it was excluded, some flaw was found in the techniques used to separate and identify the genes in question.

33.   Last August, Mignot announced that he and others experimenting with a colony of narcoleptic dogs had identified the gene that causes narcolepsy.

34.   Last year, Klar said, geneticists identified a gene that is present in normal mice but totally missing in the mutants.

35.   Lilly demonstrated that different tissue types in mice yielded different levels of resistance to virus-induced leukemia, and he identified the gene responsible for that difference.

36.   Last week, researchers reported in the journal Science that they had identified a gene that predisposes some people to anxiety.

37.   Millennium seeks to identify genes responsible for common major diseases.

38.   Nearly all agree, however, that the movement to identify genes that lead to certain conditions will ultimately lead to better treatment, even cures, for disease.

39.   Once relevant genes are identified, however, it should be possible to make small chips containing relatively few genes.

40.   Optical mapping involves selective cutting of DNA and gene sequences into defined lengths to create a pattern that helps characterize genomes and identify individual genes.