Microtubule binding protein that promotes the stabilization of dynamic microtubules. Required for separation of the spindle poles during mitotic spindle formation. May cross-link overlapping antiparallel microtubules in the spindle midzone. Self-associates. Interacts with microtubules via the TUB2 subunit. Localizes to kinetochore microtubules and to the overlapping microtubules of the spindle midzone. Present with 521 molecules/cell in log phase SD medium. Belongs to the CLASP family.