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dpp expression in embryos lacking msn. Embryos (5 to 11 hr old) from a cross between msn102/+ and msn102/+ or between msn102/+ and +/+ flies were hybridized with a dpp antisense probe. About 20% of embryos derived from the msn102/+; msn102/+ cross displayed a decrease in dpp expression in cells at the dorsal leading edge (arrow).
