obsolete ectopic activation of mitotic cell cycle spindle assembly checkpoint true OBSOLETE. A cell cycle checkpoint phenotype in which the mitotic spindle assembly checkpoint is activated at an abnormal location. The mitotic spindle assembly checkpoint is normally activated at kinetochores, and delays the metaphase/anaphase transition of a mitotic nuclear division until the spindle is correctly assembled and chromosomes are attached to the spindle. 2019-11-19T14:22:57Z FYPO:0007155 ectopic mitotic cell cycle spindle assembly checkpoint activation midori This term was made obsolete because it is not an accurate description of an observed phenotype.