Fig. 2
From: Xanthine oxidase and aldehyde oxidase contribute to allopurinol metabolism in rats
a Metabolic pathways of 1-methylxanthine (1-MX) by xanthine oxidase(XO), and (b) Effect of febuxostat on xanthine oxidase (XO) activities in Crl:CD and Jcl:SD rats. Xanthine oxidase (XO) activity was estimated as the ratio of 1-methyl uric acid (1-MU) to 1-methylxanthine (1-MX). Each bar represents the mean ± S.D. recorded from six experiments. ** p < 0.01; N.S. not significant