During mitosis, may be involved in the condensation of spindle midzone microtubules, leading to the formation of midbody. Interacts with AURKB. At interphase, localizes to centrosomes. At prometaphase and metaphase, associated with spindle microtubules and spindle poles. At anaphase, accumulates in the spindle midzone. At telophase, condensed on central spindles. During cytokinesis, condensed on the midbody where it colocalizes with AURKB (By similarity). Widely expressed in fetal tissues. In adult tissues, expressed in testis and ovary and, at much lower levels, in kidney and pancreas. Truncated N-terminus.