Fig. 4. Radial glia are derived from the Dbx-expressing neuroepithelium. (A,B) GFP
expression (green) at E12.5 showing long, fine processes labelled with GFP
extending from the ventricular surface to the pial surface (arrows). (C,D) RC2
labelling (red) at E12.5 is seen in many radial glial processes, some of which
are also GFP labelled (E,F; arrows). (G-L) Radial glial cell bodies (arrows)
appear near the pial surface at E16.5 (G-I) and E18.5 (J-L). Scale bars: in A,
100 µm; in G, 50 µm.