Enhancer trap expression is observed in the presumptive mesoderm at the onset of gastrulation and in the mesoderm at germ band retraction. Later, expression becomes restricted to myogenic cells. Expression is observed in precursors of the somatic muscles, pharyngeal muscles, visceral muscles and cardiac cells. Expression is also seen in muscle attachment sites.

Expressed in "dorso-median cells" of the ventral nerve cord. Expressed in outer sheath around midgut.