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Ectopic expression of Spp in the posterior compartment of the wing. Genotypes were as follows: en-GAL4 alone (A); en-Gal4, UAS-Spp (B); en-Gal4, UAS-Spp, Spp RNAi (C); and en-Gal4, UAS-SppM (D). Numbers refer to the five wing veins.