Mean ICa and Cm (± s.e.m.) induced by depol 1s for Group no-endo , Group slow , Group fast , Group ultrafast and Group overshoot in si-Ctrl (black, n = 5–6 cells for each group), and for 5 groups in si-CHC (red, 5–6 cells for each group), which were divided based on ICa density similar to 5 si-Ctrl groups (< 22, 22–32, 32–36, 36–41, > 41 pA/pF).
