k1 = V
k2 = k_a
k3 = F
k4 = k_el
k5 = k_12
k6 = k_21
k7 = k_on_1
k8 = k_off_1
k9 = k_on_2
k10 = k_off_2
k11 = k_syn_A
k12 = k_deg_A
k13 = k_syn_B
k14 = k_deg_B
k15 = k_int_A
k16 = k_int_B
k17 = k_int_AB
k18 = k_off_3
k19 = k_off_4
k20 = k_on_3
k21 = k_on_4
k22 = Central
k23 = Peripheral