Before revision:  Such an attachment , formed by the specific interactions between the MT and the motors, is an analog of ligand-receptor bonds , the MT and the motors anchored on the wall being the counterparts of the ligand and receptors, respectively. However, unlike other ligands, the length of a MT can change with time because of its polymerization-depolymerization kinetics .
After revision:  Such an attachment , formed by the specific interactions between the MT and the motors, is an analog of ligand-receptor bonds : The MT ligand changes its length (and thus binding sites) with time by polymerization-depolymerization kinetics .