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Stages of development indicated in lower right corners of each panel. (A–D) Whole mount in situ hybridizations showing expression of Hoxd9 (A), Hoxd10 (B), Hoxd12 (C) and Hoxd13 (D). Pect, Pectoral fin bud; Cl, cloaca. Note anterior expansion of Hoxd12 and Hoxd13 in distal fin at stage 32. Arrows mark anterior limits of expression. Yellow dotted lines in the left column mark the anterior boundaries of expression at stage 22.
