Fig. 6. Telophase/early interphase nucleus. (a) NPCs assemble at the base of bound vesicles. (b) After dispersal of the spindle membrane into the nuclear envelope, the nascent NPCs appear to be left in a semicircular arrangement. (c) NPC clusters are also observed. (d) The assembly of NPCs at the fusion junction between NE and spindle envelope or vesicles: (1) apposition of spindle vesicle to NE; (2) vesicle-NE fusion, initiating NPC assembly at the site of fusion; (3) further incorporation of vesicle membrane into NE.