Fig. 5. drl LOF mutation induces no apparent defects in the embryonic Drosophila brain. Stage 16 brains of drl^Red2/+ (A) and drl^Red2/drl^R343 (B) embryos labeled with anti-ß-galactosidase (red) and anti-HRP (green) antibodies. No apparent differences were observed between the two genetic backgrounds. Wild-type brain (C,E, with C being dorsal to E) and lio²/drl^R343 brain (D,F, with D being dorsal to F) from stage 16 embryos labeled with an anti-FASII antibody. The FASII-positive fibers do not display any apparent morphological defects in the lio²/drl^R343 mutant compared to wild type (compare C with D and E with F). Scale bars: 10 µm.