Nathalie Cartier of Inserm-University Paris Descartes poses in her research laboratory at the University Paris Descartes in Paris November 12, 2009. Scientists have managed to halt a rare and fatal brain disease with an experimental gene therapy technique using a deactivated version of the AIDS virus, a study published on November 5 showed. REUTERS/Benoit Tessier (FRANCE HEALTH SCI TECH)
Reuters/BENOIT TESSIER