dSTIM regulates wing vein differentiation. Patterning of wing veins in adult wild-type (wt) wings (A), and wings expressing dSTIMRNAiinduced by MS1096.Gal4 (B), sd.Gal4 (C) and en.Gal4 (D). The position of lateral veins I, II, III, IV and IV is shown in A. Thickened veins are present within the expression domains of each Gal4 driver, with no defects at the wing margins. Expression of dSTIMRNAidriven by en.Gal4 in a heterozygous dSTIM deficiency background (Df(1)sd72a) results in enhanced vein thickening (E) when compared to (D). Co-expression of dSTIMRNAiwith dSTIMFLdriven by en.Gal4 results in complete rescue of the thick vein phenotype (F).