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Fig. 2. Placodal gene expression patterns in neural plate stage Xenopus embryos (stages 13–14) in lateral view (anterior is to the left, all embryos are equally oriented). As in Fig. 1, color-coded arrows and arrowheads are used for the identification of comparable regions of gene expression as indicated in the schematic drawing. Green arrowhead corresponds to the lateral green arrowhead in Fig. 1 (prospective olfactory placode). Black asterisk in D indicates region where Dlx3 is expressed only in the superficial ectodermal layer. Black arrowheads in E indicate Msx1 expression in anterior neural plate. White asterisks in E and L indicate expression of Msx1 and Pax3, respectively, in a region encompassing neural crest and lateralmost neural plate. Insert in J shows incipient placodal Tbx2 expression at a slightly later (neural fold) stage. For detailed description, see text. For abbreviations, see Fig. 1.