Figure 5.

Removal of Ubx from the second-order precursors results in shaft and socket development of the apical bristle on T3 and converts preapical bristle morphology on T3 towards T2. (A–D) Double arrowhead marks the apical bristle, arrowhead marks the preapical bristle. (A) Wild-type second leg and (B) wild-type third leg. (C) Second leg of experimental animal expressing the Sb mutation in apical and preapical bristle. (D) Third leg in which mitotic recombination driven in the sensory organ lineage resulted in Sb⁺ macrochaetes.