Enhancer trap expression is observed in mature neruons in the central and peripheral nervous systems in the adult. Specifically, staining is observed in sensory neurons on the third antennal segment, the proboscis, and the maxillary palps. Staining is also observed in macrophages that are associated with a number of structures throughout development. In the embryo, staining is observed in germband extended embryos in cells surrounding the tracheal pits and in the procephalic lobe. Staining is observed along the posterior border of segment boundaries during germband retraction. Staining also occurs in the amnioserosa and is observed as two rows of cells during dorsal closure. Staining is observed in mature neurons of the embryonic central and peripheral nervous systems and is most prominent in the cells of the antenno-maxillary complex.