Fig. 5. Na influx as a function of time in washed red blood cells (RBCs) in the presence of 10^–4 mol l^-1 ouabain in (A) deoxygenated cells (equilibrated to humidified N₂ for 10 min prior to treatments) or (B) air-equilibrated cells. The Na influx was measured in unstimulated cells to get the basal influx and in cells stimulated by 10^–5 mol l^-1 isoproterenol at time zero either alone or in the presence of transport inhibitors. ^* indicates statistical difference from basal influx within same time interval; indicates statistical difference from influx in isoproterenol stimulated cells within same time interval; indicates statistical difference from same treatment in the 5–15 min time interval. P<0.05. (A) N=4 and (B) N=6.