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zathioprine is used in organ transplantation and autoimmune disease. Some of the autoimmune diseases are rheumatoid arthritis, pemphigus, Inflammatory Bowel Disease (such as Crohn's disease and Ulcerative Colitis), multiple sclerosis, autoimmune hepatitis and restrictive lung disease. Azathioprine interferes with the synthesis of purines (adenine and guanine), which is required for DNA synthesis. Fast-growing cells, including T-cells and B-cells, are particularly affected by the inhibition of purine synthesis. It is a pro-drug, converted in the body to the active metabolites 6-mercaptopurine (6-MP) and 6-thioinosinic acid.