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. Author manuscript; available in PMC: 2014 Dec 2.
Published in final edited form as: Semin Arthritis Rheum. 2014 May 9;44(2):170–174. doi: 10.1016/j.semarthrit.2014.05.007

Figure 4.

Figure 4

Mechanisms for failure to reach target serum urate in patients receiving allopurinol (middle boxes), and potential clinical responses (lower boxes). SU: serum urate, XOI: xanthine oxidase inhibitor.