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Fig. 3 Loss of fin progenitors with posterior expansion of cardiac marker expression in hoxba;hoxbb mutants. (A–F) Expression patterns of tbx5a were compared between sibling wild-type and hoxba;hoxbb homozygous embryos during embryogenesis. The range of tbx5a expression in the lateral mesoderm is indicated by a bracket. The progenitor cells of pectoral fins are indicated by an arrowhead. (G, H) Expression patterns of nkx2.5 were compared between sibling and hoxba;hoxbb mutants. Enlarged views are shown in (G’, H’). The different regions of nkx2.5 expression between wild-type and mutants are indicated by brackets. (I, J) Expression patterns of cmlc2 are shown. All images were captured from the dorsal side. For each stage, reproducibility was confirmed with at least three different specimens. Scale bars indicate 100 µm.