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Fig. 1. Whole mount in situ hybridization of Xenopus laevis embryos at stage 13. The expression of Isl1, Nkx2.5, GATA6b, Tbx1, and FGF8b is given. Anterior views (upper row) of embryos are shown. Dashed lines indicate the level of sagittal sections shown in the lower row. e, endoderm; ect, ectoderm; m, mesoderm.