Fig. 2. Prophase nuclear morphology. (a) Nuclei are spherical with 9.5 µm diameter. (b) NPCs appear to be partially dismantled and (c) the central channel is less electron dense in TEM thin sections (arrows). (d-f) FESEM also shows that they are empty in the middle, suggesting that the transporter has been removed leaving the star ring. (g-i) Other intermediates observed in prophase.