Fig. 5. Loss of Ba²⁺-blockade of K⁺-channels of the basolateral membrane of principal cells after metabolic inhibition with CN. The effect of peritubular BaCl₂ (5 mmol l^-1), a competitive blocker of K⁺-channels, was evaluated on basolateral membrane voltage V_bl and input resistance R_pc of principal cells of Malpighian tubules isolated from Aedes aegypti. Values are means ± S.E.M. of 9-50 cells. NS, not significant.