L	length of cilium. 40μm≤L≤50μm
rc	ciliary radius. 0.15μm
Ri	ciliary intracellular resistivity. 9.2×105 μm/S
ra	ciliary intracellular resistance. $r_{\text{a}}=R_{\text{i}}/\pi r_{\text{c}}^2=1.5\times {10}^{-2}/\text{nS}\mu \text{m}$
gCNG	single CNG channel conductance. 5.0×10−4 nS/ch
gCl	single Cl(Ca) channel conductance. 8.0×10−4 nS/ch
K1/2	half maximum concentration of Ca2+ to activate Cl(Ca) channels. 4.8μM
Pmax	maximum open probability of CNG channels. 0.7 no units
DCa	Ca2+diffusion coefficient. 300 (μm)2/s [1]
DB	BAPTA diffusion coefficient. 95 (μm)2/s [8]
D	approximated diffusion coefficient. 100 (μm)2/s
k+	forward reaction rate constant. 600/μMs [8]
k−	backward reaction rate constant. 100s−1 [8]
BT	total concentration of BAPTA (complex plus free). 2000μM
q	converting factor of transmembrane current. $q={(2\pi F{r}_{\text{c}}^2)}^{-1}=8.45\times {10}^4\mu \text{M}\mu \text{m}/\text{pAs}$ [9]
α	conversion factor for binding. 2.7×10−2 μMμm/molecule
BS	number of binding sites. 1 molecule/ch
fCNG	fraction of the CNG current carried by Ca2+. 0.4 no units [10]
fX	computational parameter. 0.97 no units
gX	single Na+/Ca2+ exchanger conductance. gX = fX fCNGgCNG Pmax = 1.3×10−4 nS/ch
K	reaction dissociation constant. $K=k_{-}/k_{+}=\frac{1}{6}\mu \text{M}$
TCNG	total number of CNG channels. Units ch
TCl	total number of Cl(Ca) channels. Units ch
TX	total number of Na+/Ca2+ exchangers. Units ch
cBulk	free calcium concentration at the exposed end of the cilium. cBulk = 300μM for the diffusion experiment and for the interaction experiment cBulk = 0μM
vBulk	voltage clamp. vBulk = −50mV for the diffusion experiment and for the interaction experiment vBulk = −40, −60 and −80mV