MODEL RELEASED. Gene therapy. Geneticist Dr Donald Kohn with a five-month-old Apache baby who suffers from SCID (severe combined immunodeficiency). The baby is receiving gene therapy for its condition. It is isolated in a sterile tent to prevent infection. The rare genetic mutation of SCID destroys the immune system making the body unable to fight infection. SCID babies lack a vital enzyme, which their immune system needs. Gene therapy involves inserting a gene for this enzyme into stem bone marrow cells and transplanting the cells into the baby. With this enzyme, stem cells may produce normal immune system blood cells. Photographed at the Children's Hospital in Los Angeles, USA.