al; Prospective genetic screening decreases the incidence of abacavir hypersensitivity reactions in the Western Australian HIV cohort study; Clin Infect Dis; 2006 Jul1; 43(1):99-102. Glossary: Locus (plural loci): the specific location of a gene or DNA sequence on a chromosome, (e.g.; 8p21.1 is the p21.1 region on Chromosome 8). Gene :