50.0 0 giant Axon A quantitative description of membrane current and its application to conduction and excitation in nerve. 1952. Bull. Math. Biol., 1990, 52, 25-71; discussion 5-23 (0.1*(25-v))/(exp((25-v)/10) -1.0) 4.0 * (exp(-v/18)) 0.07 * exp(-v/20) 1/(exp((30-v)/10) + 1.0)