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2+ channel (LTCC) current by detubulation. (A) The representative trace shows the shortening of atrial action potential (AP) by detubulation. (B) AP amplitudes are not changed by detubulation. (C) Change of action potential duration (APD)20, APD50, and APD90 by detubulation (*p < 0.05). Representative LTCC traces (D) and I-V curves (E) show the reduction of LTCC by detubulation.
