Fig. 6
Ba2+-sensitive component of the membrane currents in response to 2-s hyperpolarizing voltage pulses from − 40 mV. A Representative current traces recorded from PV cells of rat (a), guinea pig (b), and rabbit (c). The currents were obtained by subtracting the currents in the presence of 1 mM Ba2+ from those in the absence of Ba2+. The I–V relationships were obtained for the initial peak and the end of the Ba2+-sensitive current. B Time constants were obtained by the least squares fit of the Ba2+-sensitive current with a sum of two exponential functions. Open and filled symbols indicate fast and slow components, respectively, and circles, squares and triangles indicate rat, rabbit and guinea pig, respectively. C Relative amplitude of the fast component. Open circles, open triangles and filled squares indicate rat, guinea pig and rabbit, respectively