| Production was not abrogated by inhibitors of cyclooxygenases, xanthine oxidase, nitric oxide synthases, and mitochondrial enzymes. |
| Stones can be composed of calcium, oxalate, urate, cystine, xanthine, phosphate, or all of these. |
| At Lethbridge, female sheep keds have been found to excrete xanthine and hypoxanthine as well as uric acid. |
| Unlike mercaptopurine and azathioprine, its metabolism is not inhibited by the xanthine oxidase inhibitor, allopurinol. |
| Maturation induced by xanthine oxidase was prevented by allopurinol, an inhibitor of xanthine oxidase activity, and by N-acetylcysteine. |
| Xanthinuria, rare inherited disorder of purine metabolism that results from a deficiency in the enzyme xanthine oxidase. |
