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Representative traces recorded from an Epi (A) and Endo cell (B) showing the recovery of INa. Recovery was measured using two identical voltage-clamp steps to −20 mV from a HP of −100 mV separated by selected time intervals. The recovery time course of INa, recorded from the two cell types (C), was fit by two exponentials. The slow phase of recovery was significantly slower in Epi cells (P < 0.05; C).
