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Fig. 3. Overexpression of the tethered Twist-Twist dimer in the mesoderm leads to ectopic expression of Kr in the visceral mesoderm. (A,B) Lateral view of stage 15 embryos stained for Kr. (A) Wild-type visceral muscle showing no Kr staining surrounding the gut. (B) Ectopic expression of UAS-Twi-Twi in the mesoderm induces expression of the founder cell marker Kr (arrowhead) in the mesoderm surrounding the gut, suggesting a conversion of visceral mesoderm into somatic muscles.