Misexpression of DIMM produces ectopic SYT expression. Top, Schematized drawing of the Tv cluster in the larval CNS. Bottom, Ectopic expression of DIMM within Tv cells produces ectopic SYT expression. ap-gal4 is expressed throughout the four cell Tv cluster, but only two Tv cells are SYT-α-positive (A) and SYT-β-positive (C). Overexpression of DIMM in all four Tv neurons generates ectopic expression of SYT-α (B) and SYT-β (D). A, C, ap-gal4/UAS-2XEGFP. B, D, ap-GAL4/UAS-dimm-myc. Arrow indicates SYT-α/β-positive cells.