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Fig. 6. Tracheal pMad patterns in wild-type and elB mutant embryos. (A) In wild-type embryos pMad (green) is induced at stage 11 by dorsal and lateral stripes of Dpp expression. pMad is observed in approx. five dorsal tracheal cells and 10-15 ventrolateral tracheal cells. (B) At stage 13 pMad is still detected in the same cells. (C,D) In elB mutants at stages 11 and 12, normal pMad is detected in the trachea. All tracheal nuclei are marked by anti-Trh (red).





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