Fig. 1. abdA is necessary and sufficient to specify oenocytes. In this and subsequent figures, oenocytes are labelled with anti-Sal unless otherwise stated. (A,B) Anti-ß-galactosidase immunostaining of late embryos carrying svp-lacZ showing oenocyte clusters present in A1-A7 (indicated) in a wild-type background (A) but missing in an exd^B108 mutant (B). (C-F) Late embryos homozygous for Antp^RW10 (C) or Ubx^bxd100 (D) display normal oenocyte clusters whereas those homozygous for abdA^M1 (E) do not. Scr⁴ Antp²⁵ (F) double mutants show a wild type oenocyte pattern. (G,H) Using en-GAL4 to drive UAS-Ubx (G) or UAS-abdA (H) indicates that AbdA but not Ubx can specify oenocytes in T1-T3 (indicated).