"A molecular motor walking along its cellular track can be described by the following kinetic scheme ...−2 ⇌− 1⇌0⇌1⇌2⇌3⇌ ⋯ Here the integers = −1, 0, 1, 2, ... enumerate the binding sites along the motor track. The distance between the neighboring binding sites is (such that they are located at coordinates = −, 0, , 2, 3 ... ), and we assume that the track goes on forever.