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Fig. 5. (A) The effect of apical (a) or basolateral (b) sodium azide on K+ current. K32, standard saline (see Materials and methods). Azide concentrations are given in mmol l–1. (B) Percentage of control K+ current (IK) after apical or basolateral addition of 1 or 10 mmol l–1 sodium azide. Values are means + S.E.M. (N=4).