Overexpression analysis of CDM pathway members in the musculature. (A–D′) Low magnification (A, B, C, D) and high magnification (A′ B′, C′, D′) views of stage 16 embryos expressing UAS-cDNAs under control of the pan-mesodermal mef2-GAL4 driver. (A, A′) Embryos of the genotype mef2-GAL4 show a mature muscle pattern with no missing muscles and unfused myoblasts. (B–C′) Expression of UAS-mbc or UAS-elmo, respectively, has no effect on the muscle pattern. (D, D′) Co-expression of UAS-elmo and UAS-mbc results in missing muscles and many unfused myoblasts. All views are lateral, with anterior to the left and dorsal to the top. Scale bar, 50μM