Expression of MrtfΔNΔC.H.Scer\UAS under the control of Scer\GAL4btl.PS results in defects in the tracheal system in embryos; the dorsal and ganglionic branches are often truncated or missing. Expression of MrtfΔNΔC.H.Scer\UAS under the control of Scer\GAL4da.G32 in embryos results in inhibition of branching in the tracheal system. Defects in mesoderm migration are also seen in these embryos. Expression of MrtfΔNΔC.H.Scer\UAS under the control of Scer\GAL4Bx-MS1096 results in a reduction of intervein tissue in the wing and often results in a failure of the two layers of the wing to fuse completely.