Fig. 3. Temporally regulated wg expression distinguishes maxillary and antennal differentiation programs. (Top left) A schematic representation shows the normal temporal programs for dpp (red) and wg (green) expression in antennal and maxillary territories. (A,B) larval imaginal discs and adult heads harbouring mx-to-antennal transformations (mx>a). (Bottom left) The timing of wg mis-expression (see Materials and methods) is indicated by the striped green lines under the time bar. Each corresponds to a line in the results table, bottom right, indicating the effects of temporally regulated Wg mis-expression scored on Dan expression and on the adult mx>a transformation. Antennal discs are oriented with posterior towards the right and dorsal towards the bottom; a and mx indicate antenna and maxillary primordia, respectively.