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Plasma concentrations of uric acid (▿, ▾), hypoxanthine (◊, ♦), xanthine (□, ▪), and the sum of uric acid, hypoxanthine, and xanthine ((
), (
)), after oral administration of 200 mg allopurinol to elderly (solid symbols) and young subjects (open symbols). Note that the scale for hypoxanthine and xanthine (right y-axis) is 10-fold expanded compared with that for uric acid. Values are means±s.e. mean.
