Fig. 2

(a-c??) Lateral views with anterior to the left. Scale bars=10 ?m. (a-a??) shha (arrows) is expressed in the posterior mesenchyme of the fin bud at 32 hours post fertilization (hpf) in wt embryos (a), tbx5b mutant (a?), and Tbx5b knock-down (a??) embryos. (b-b??) dlx2a (arrows) is expressed in the AER of the fin bud at 32 hpf in the wt (b), tbx5b mutant (b?) and Tbx5b knock-down (b??) embryos, (c-c??) bmp4 (arrows) is expressed in the wt fin at 48 hpf (c). tbx5b mutant (c?) and Tbx5b knock-down (c??) embryos, (d-d???) Arrows indicate the normal location of fgf24 expression in the fin field at 21 hpf. Embryos are shown in a dorsal view with anterior to the top. Scale bar =100?m. (d) fgf24 is expressed in the fin field of wildtype embryos. (d?) fgf24 is absent from the fin field of Tbx5a knock-down embryos. (d??) fgf24 expression is decreased in the fin field of Tbx5b knock-down embryos. (d???) fgf24 expression is absent in double knock-down embryos.