Fig. 6. Df(1)w^67k30 is a rst, kirre double mutant and shows severe muscle defects. (A) Wild-type abdominal muscle pattern as revealed by staining against ß-3-tubulin. vl, ventral longitudinal muscles; sb, segment border muscle. (B) Df(1)w^67k30 embryos display a drastic myoblast fusion phenotype with thin outgrowing muscle founder cells and many unfused myoblasts (asterisks). (C) Detailed view of two abdominal hemisegments of the same embryo. Scale bars: 20 µm.