Figure 3.

Ultrastructural resemblance of lumenal particles to aged midbodies of NE cells. EM analysis of serial ultrathin (70 nm) plastic sections of the apical surface of E10.5 mouse telencephalic neuroepithelium. (A) Midbody connecting NE daughter cells in telophase. (B–D) Series showing every other section of an aged midbody. (E) Midbody of an NE cell that has relocated the centriole (arrow) apically. (F–H) Series showing every third section of an electron-dense particle detached from the apical surface of the neuroepithelium. Arrowheads indicate plasma membrane buds and protrusions, and asterisks indicate adherens junctions. The complete sequence of serial sections from which A, E, and F–H were selected is shown in Fig. S4 (A–C), respectively (available at http://www.jcb.org/cgi/content/full/jcb.200608137/DC1). Bars, 500 nm.