Expression of the endogenous hunchback gene (hb) and enhancer-reporter transgenes (HG series) in stage 11 neuroblasts. Confocal imaging of embryos stained for GFP (top row) and the neuroblast marker Deadpan (Dpn, bottom row). Lines HG4-1, HG4-3, and HG4-7 show expression in most or all neuroblasts (“neuroblast element” label, at bottom). Two segments are shown, determined by Engrailed staining (not shown). Scale bar, 10 μm.