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|A monoclonal antibody used to treat psoriasis (a chronic skin disease). It is also being studied in the treatment of graft-versus-host disease (GVHD) of the skin after a donor stem cell transplant. Raptiva binds to a molecule called LFA-1, and blocks the action of T cells (a type of white blood cell). It is a type of immunosuppressant. Also called efalizumab.|