Figure 4: Expression of pb, hh, wg, and dpp-GAL4 drivers during maxillary palpus development. In panels (A)–(D), the driver is indicated on the bottom lefthand corner. The arrowheads indicate the developing maxillary palpus and the arrows in panel (C) indicate the developing lancinia. The tissue is stained with DAPI (blue), and the expression of the drivers was detected with a UASEGFP reporter (green). Panel (E) is the expression of hh-GAL4 in the wing marked by expression of from the UAStrcS292A T453A reporter. The dotted line indicates the anterior-posterior compartment boundary, and multiple short bristles are observed in the posterior compartment. Panels (F) and (G) are the expression of hh-GAL4 in the maxillary palpus marked by expression of from the UAStrcS292A T453A reporter. The box in (F) indicates the close-up shown in (G). The dotted line in (G) indicates the field of cells that have multiple short tricombs indicating expression of .