Overexpression of B-H1Scer\UAS.cSa under the control of Scer\GAL4dpp.blk1 results in ectopic fold formation in the leg disc along the boundary of B-H1 expressing and non-expressing cells. The formation of the endogenous central fold is interrupted. No ectopic folding is seen prior to the onset of central folding. Overexpression of B-H1Scer\UAS.cSa under the control of Scer\GAL4ap-md544 occasionally results in the partial transformation of tarsal segment 4 into tarsal segment 5; the ventralmost bristle at the distal tip of segment 4 is transformed from a thick, black bristle (characteristic of segment 4) into a thin and less-pigmented bristle (characteristic of segment 5). Tarsal segments 4 and 5 are partially fused with each other.