Ninein (also known asGSK3beta-interacting protein and ninein centrosomal protein) is a chromosome segregation ATPase with 5 reported isoforms, (molecular weights ranging from 236 to 246 kD). Ninein is localized at the centrosome and is thought to position and anchor microtubules minus-ends. Ninein is important for centrosomal function in epithelial cells. This protein is modified by phosphorylation. Ninein has also been shown to interact with CEP250/c-Nap1, CEP110, gamma-tubulin, centrin, GSK3beta, AIK, and PKA. The Poly6028 antibody recognizes the N-terminal region of human ninein and has been shown to be useful for Western blotting.