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(A) Superimposed whole cell outward K+ current traces recorded from PTIP+ and PTIP– mice. (B) Ito current-voltage relationships for PTIP+ myocytes (N = 2, n = 6) and PTIP– myocytes (N = 2, n = 4) **P < 0.01, ***P < 0.001. Data are mean ± SEM.
