Enhancer trap expression is observed in a 6 developing muscles in A1-A7 in the embryo. It is also observed in four pairs of cells associated with a subset of PNS neurons in each abdominal hemisegment. Two are associated with the dendrites of two es neurons of the dorsal cluster and two with the dendrites of two es neurons of the lateral cluster. These cells may be tormogen and trichogen accessory cells.
ap41F arose in same chromosome; P{PZ}41F is inserted 3\' of ap and apparently does not contribute to the ap41F phenotype.