Involved in organization of the bipolar mitotic spindle. Required for bipolar spindle assembly, mitosis progression and cytokinesis. May act by stabilizing interphase microtubules (By similarity). Binds to purified microtubules via its C-terminus. Localizes to microtubules in interphase, associates with the mitotic spindle during mitosis, localizes to the central body during cytokinesis. Contaminating sequence. Potential poly-A sequence. Contaminating sequence. Potential poly-A sequence.