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Fig. 5. Misexpression of hbs in the embryonic mesoderm disrupts myoblast fusion. (A) Wild type pattern of the ventral musculature. (B) UAS-hbs;twi-GAL4 embryo showing partial failure of myoblast fusion. Arrowheads indicate unfused myoblasts. (C) UAS-hbs/+;da-GAL4/+showing both partial failure of myoblast fusion (arrowheads), and absence of a muscle fiber in the ventral muscle group (arrow). Preparations are stained with mAb FMM5.