Db	(One-dimensional) diffusion coefficient of bound motors.
Dub	Diffusion coefficient of unbound motors.
f(r)	Radial part of the concentration profile in a tube.
h	Height of the slab to which a filament aster is confined.
jb	Local current of bound motors.
jub	Local current of unbound motors.
	Spatially averaged current of bound motors in a closed tube.
λ	Lattice constant, given by the filament repeat distance.
L	Linear extension of the compartment, i.e., length of the tube or radius of the disk.
L*	Length of crowded region (traffic jam).
n	Coordinate along the filament in the general case, n = x and n = r for uniaxial and radial filament arrangements, respectively.
N	Number of motors.
Nf	Number of filaments.
N	Normalization constant.
r	Radial coordinate in the aster geometry.
R	Radius of closed tube.
t	Time variable.
u	Radial coordinate in the tube geometry.
vb	Velocity of bound motor.
x	Spatial coordinate parallel to the filament.
y, z	Spatial coordinates perpendicular to the filament.
α	Probability for a forward step of a bound motor per unit time τ.
β	Probability for a backward step of a bound motor per unit time τ.
γ	Dwell probability of a bound motor per unit time τ.
ε	Detachment parameter, for which ε/6 is the detachment probability per nonfilament neighbor site per unit time τ.
	Rescaled detachment probability,
η	Exponent of the asymptotic density profiles in asters.
ξ	Localization length or decay length of the density profiles.
πad	Sticking probability for a motor hopping to the filament.
	Rescaled sticking probability,
	Average motor density (bound and unbound motors).
ρb	Density of motors bound to the filament.
ρub	Density of unbound motors.
τ	Basic time unit, defined by τ = ℓ2/Dub.
τs	Step time.
φ	Ratio of the number of filament channels to the number of nonfilament channels; uniaxial arrangements: tube cross-section/filament number, asters: radius-dependent effective cross-section/filament number.
φ0	Parameter for the ratio of bound to unbound channels in the case of asters.