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Fig. 5. Two different responses of basolateral membrane potential (Vbl) to barium in the presence of a low K+ concentration. (A) Significant hyperpolarization of the Vbl was seen in eight impalements (P<0.01) and (B) a depolarization was seen in 13 impalements (P<0.001). The break in the line in B was due to disturbances; time elapsed was 3 min.