Closure? The death of Jolee Mohr, shown here with her family, was unrelated to the gene-therapy treatment she received, the study's sponsor says.Credit: Mohr Family/AP Images Federal regulators have given a green light to a gene-therapy arthritis trial that was halted last summer after a patient died. New tests indicate that the therapy played no role in the death. The decision comes as a relief to gene-therapy researchers who had worried about a potential new setback for their field. The trial conducted by Targeted Genetics Corp. was shut down after the 24 July death of 36-year-old Jolee Mohr of Taylorville,...