Fig. 4. The post-optic glial bridge is disrupted in yot (gli2DR) mutants.
Axons (anti-AT; green) and Gfap+ cells (red) at 20 hpf (A,D), 24-25 hpf (B,E),
and 36 hpf (C,F) in wild type (WT; A-C) and yot (gli2DR) mutants
(D-F). (D-F) POC and RGC axons do not cross the midline in yot
(gli2DR) mutants (E,F, arrowheads)
(Karlstrom et al., 1999).
Gfap+ cells are reduced at the midline in the region where the POC would
normally form (right brackets), and spread into the pre-optic area (left
brackets). Frontal views, anterior up, dotted line marks the optic recess.