Fig. 1. pros and svp mutants show an opposite phenotype with respect to neural Hunchback expression. Dorsal views of wild-type (A), pros^C7 (B), svp^e22 mutant (C) and pros^C7, svp^e22 double mutant (D) embryos at stage 14, stained for Hb protein (green). Thin dashed lines indicate lateral borders of the ventral nerve cord; thick dashed line indicates the midline. (B) In the absence of pros function there are fewer Hb-expressing cells within the ventral nerve cord than in wild type (A), whereas svp^e22 mutant (C) and pros^C7, svp^e22 double mutant embryos (D) show more Hb-expressing cells. Scale bar: 20 µm.