ACE and pulmonary arterial hypertension: We used the terms scleroderma,systemic sclerosis, Raynaud's phenomenon, pulmonary hypertension,methotrexate, cyclosporin, tacrolimus, relaxin, low-dose penicillamine, IVIg,calcium channel blockers, losartan, prazocin, iloprost, N-acetylcysteine, bosentan,cyclophosphamide, lung transplantation, ACE inhibitors,anti-thymocyte globulin, and stem cell transplantation.