Fig. 7. Reintroduction of Rst into the mesoderm rescues the phenotype of Df(1)w^67k30, Nfa-g embryos (see Materials and Methods). (A) Df(1)w^67k30, Nfa-g/Y embryo displaying a strong myoblast fusion phenotype. (B) Df(1)w^67k30, Nfa-g/Y, twi-Gal4 x UAS-rst embryo displaying a nearly wild-type abdominal muscle pattern with minor defects: some muscles are thin (arrow) and some terminate in ectopic positions (asterisk). (C) Hetero- or homozygously balanced embryo out of the same cross (indistinguishable from wild-type). vl, ventral longitudinal muscles. Scale bar: 20 µm.