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Radioactivity concentrations in the trachea and lung after a single intranasal administration of [14C]CS-8958, [14C]R-125489, or [14C]zanamivir to mice at a dose of 0.5 μmol/kg (4 mice/time point; data are means ± standard deviations). (A) Trachea; (B) lung. Filled, shaded, and open bars represent the administration of [14C]CS-8958, [14C]R-125489, and [14C]zanamivir, respectively.
