To go to the article: "NuMA is a component of an insoluble matrix at mitotic spindle poles". Dionne, Mary A, Howard, Louisa and Compton, Duane A. Cell Motility and the Cytoskeleton Volume 42, Issue 3, pp189-203 (1999). click here.  Cell Motility and the Cytoskeleton Volume 42 (3)  1999 cover