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Fig. 2. Otk is highly enriched in R1-R6 growth cones. Third-instar eyebrain
complexes were double-stained with MAb 24B10 (green) and anti-Otk antibody
(red). In a wild type optic lobe (A-C), anti-Otk immunoreactivity was detected
in both lamina and medulla. The strongest staining was detected in the lamina
plexus, consisting mainly of R1-R6 growth cones at this developmental stage.
In an otk3 eye-specific mosaic individual in which most
R-cell axons were otk3 mutant axons (D-F), anti-Otk
immunoreactivity was largely absent in the lamina plexus. Scale bar: 20
µm.