Before revision:  In many biological processes, the length distribution of the MTs is controlled by a class of motor proteins called depolymerases (DPs). A DP diffuses or walks along a MT to reach one of the tips of the MT andthen begins depolymerizing the MT itself .
After revision:  In many biological processes, the length distribution of the MTs is controlled by a class of motor proteins , called depolymerases. Experiments have shown that, following binding to the MT andthen begins depolymerizing the MT itself .