Fig. 7. Loss of Wingless activity affects the formation of row 5 NBs and expression of Gsb and Wg is unaffected in mid mutants but the expression of Gsb-n is lost from the eRP2. Wild-type (WT) and mid or wg mutant Drosophila embryos stained with antibodies to Gsb (Gsb-d) (A-C), Wg (D,E) or Gsb-n (F-H). Anterior is up; midline is marked by vertical line(s). Numbers in the midline indicate NB rows; NBs are indicated by row number followed by NB number (e.g. 5-6 = NB5-6 = NB6 on row 5).