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Figure 3. Cross section analysis of the spatial expression patterns of the fgf1, fgf4, and fgf8 subfamilies. Coronal sections of indicated fgfs from the whole mount in situ hybridisations shown in Figure 2. The black lines indicate the position of the sections shown; when multiple sections are shown, numbers correspond to the appropriate black line and, therefore, the section's position on the embryo. In all sections, dorsal is up and ventral is down.