Fig. 5.

Varying the concentration of Ca²⁺ in the pipette Ringer's solution from 1 mmol l⁻¹ to 4 mmol l⁻¹ resulted in a modest reduction in conductance at the higher concentration. Permeability values calculated from Goldman–Hodgkin–Katz equation fits are presented in the text. Each point is the mean ± 1 s.e.m. for the number of trials indicated.