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Expression of stickleback and zebrafish FgfD genes in the trunk. A, C, E, stickleback embryos. B, D, F, zebrafish embryos. A, B, fgf18 and fgf18a. C, D, fgf18 and fgf18a. E, F, fgf24. Abbreviations: pan, pancreas; spn, spinal cord neurons.