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Effect of XAG administration (black bars) versus time control (TC) group (open bars) on urinary excretion of nitrite/nitrate measured by Griess reagent colorimetric assay in clearance studies. BL, baseline period; CP1, clearance period 1; CP2, clearance period 2. *Statistically different compared with baseline value in the same group. XAG, 8-o-β-d-glucoside derivative of xanthurenic acid.
