Zhang, Z Excess nitric oxide in ulcerative colitis may be generated by nitric oxide synthase independent pathways. [electronic resource] - Gut Mar 1999 - 441 p. digital Publication Type: Letter ISSN: 0017-5749 Standard No.: 10.1136/gut.44.3.439c doi Subjects--Topical Terms: Colitis, Ulcerative--metabolismHumansNitric Oxide--biosynthesisNitric Oxide Synthase--metabolism