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Glutathione, L-cysteine, DL-homocysteine, D-penicillin, hemoglobin (bovine), methylene blue and Medium 199 sets were purchased from Sigma Chemical Co., St. Louis, Mo. N-acetylcysteine was obtained from Aldrich Chemical Co., Milwaukee, Wis. Captopril was kindly provided by Dr. Victor Dzau. Sodium nitrite, histamine and methacholine were purchased from Fisher Scientific, Fairlawn, N.J. Leukotriene D4 was purchased from Anaquest, BOC Inc., Madison, Wis. Antibiotic/antimycotic mixture (10,000 U/ml penicillin G sodium, 10,000 mg/ml, streptomycin sulfate, 25 mg/ml amphotericin B) was purchased from Gibco laboratories, Grand Island, N.Y. Radioimmunoassay kits for the determination of cyclic GMP were purchased from New England Nuclear, Boston, Mass.