Fig. 3
Ih in rat, guinea pig, and rabbit PV cardiomyocytes. Recordings from PV cardiomyocytes of rat (left), guinea pig (middle), and rabbit (right). Recordings in each animal were obtained in the same cell with 2-s hyperpolarizing pulses from − 40 mV to − 140 mV in 10 mV steps. Representative current traces were obtained in Tyrode solution containing 0.3 μM nisoldipine (top row). Then, the same pulse protocol was applied after addition of 1 mM Ba2+ (2nd row), 5 mM Cs+ (3rd row) and 1 mM Cd2+ (bottom row). The dashed line indicates 0 current level