Fig. 1. Expression of Labial and labial loss-of-function phenotype in the Drosophila embryonic brain. Laser confocal microscopy of stage 15 embryos, reconstructions of optical sections. (A,C,E) Frontal views; (B,D,F) lateral views. (A,B) Wild-type embryonic brain. Anti-HRP immunolabeling. Arrows indicate circumesophageal connectives, arrowhead indicates tritocerebral commissure. (C,D) Wild-type embryonic brain. Double immunolabeling with anti-HRP (red) and anti-Lab (green). Arrows indicate Lab expression domain, arrowhead indicates tritocerebral commissure. Same embryo as in A,B. (E,F) lab loss-of-function mutant embryonic brain. Anti-HRP immunolabeling. Arrows indicate missing circumesophageal connectives, arrowhead indicates missing tritocerebral commissure.
