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Fig. 6. The cells of the visceral mesoderm of jeb^weli and mili^Alk mutants become incorporated in the somatic musculature. Ventrolateral (A,B,C) muscles of stage 16 embryos as visualised by ß3tubulin expression (green in A-F). Cells of the visceral mesoderm are marked by bap-lacZ expression (red in D-F). Compared with the wild type (A) the somatic muscles in both jeb^weli and mili^Alk mutants are thinner and show long thin projections (B,C; arrow in B). Several unfused myoblasts are visible (arrow in C). (D-F) In wild-type embryos, no bap-lacZ expression is found in the somatic mesoderm during all stages of development (stage 14, D). By contrast, jeb^weli and mili^Alk mutant embryos exhibit bap-lacZ expression in the lateral muscles of the somatic mesoderm (stage 14, E,F).

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