1.0 0.0 0.0 3.0E-4 (I + (V * (0.2 - V) * (-1.0 + V)) - C) (0.0020 * (V - C)) (0.5 * ((1.0 - x) ^ 2.0)) J2 C_init J1 V_diffusionRate V_init 0.0, 0.05, 0.1, 0.2 0.2