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Fig. 1 Lack of pectoral fins in hoxba;hoxbb cluster-deleted mutants. (A–G) Dorsal views of live zebrafish larvae at 3 dpf, obtained from intercrosses between hoxba;hoxbb cluster-deficient hemizygous fish. Arrowheads indicate the positions of the pectoral fins. (H–L) Expression patterns of tbx5a in the pectoral fin bud (arrowhead) at 30 hpf. Dorsal views are shown, and the genotype of each specimen was determined. For each genotype, reproducibility was confirmed with at least three different specimens. Genotyping revealed that all the embryos lacking pectoral fins (n = 15) were hoxba;hoxbb double homozygotes. Scale bars are 100 µm.