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A, typical pacemaker activity of an SA node cell with ICl(Ca) (○; Cm, 29 pF) and an SA node cell without ICl(Ca) (•; Cm, 62 pF). B-D, average I-V relationship of If (B), Ipeak (C), and Iqss (D) of 7 cells with (•) and 14 cells without (○) ICl(Ca). Both quasi steady-state and tail currents of Iqss and If are shown.
