Probable microtubule plus-end tracking protein that promotes the stabilization of dynamic microtubules. Required for the formation of mitotic and meiotic spindles. Specifically promotes the polymerization of kinetochore-bound microtubules. Also required for cytoplasmic streaming (By similarity). Interacts with hcp-1 and hcp-2. Localized to kinetochores during metaphase, and to the spindle region. Belongs to the CLASP family. The C-terminus of this protein appears likely to be in the unsequenced region.