Fig. 1. bab is required for joint formation in the distal leg and antenna. Wild-type cuticles of Drosophila leg (A), and antenna (B). Tarsal joints in the leg are indicated by arrows. The a4/a5 joint in the antenna is indicated by an arrowhead, the a5/arista joint by an arrow. (C) Tarsal joints (arrows) are fused or absent in the bab null leg (Godt et al., 1993). (D) The a4/a5 and a5/arista joints are absent in the bab null antenna (Godt et al., 1993). (E,F) The expression patterns of bab-lacZ during pupal stages are consistent with the phenotypes of the adult tarsal and antennal joints.
