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Fig. 5. pnr and ush mutants exhibit reduced dpp expression. (A-C) Stage 11. (D-F) Stage 13. (A,D) Wild-type dpp expression. dpp is expressed in two stripes, one along the dorsal edge of the ectoderm and the other more laterally. pnr and ush mutants exhibit normal dpp expression at stage 11 (B,C), but reduced expression at later stages (E,F). Note gaps in dpp expression (arrows).