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The latest hopes of curing AIDS were dashed Friday when US researchers said HIV returned in two men who briefly eradicated the virus after bone marrow transplants for cancer. Experts described the discovery as a "disappointment," but said it offers important new clues in the hunt for the human immunodeficiency virus's elusive hiding places in the body. Only one person is believed to have been cured of HIV. American Timothy Brown, who suffered from leukemia, received a bone marrow transplant from a rare donor who was resistant to HIV, and has shown no sign of the virus for six years.