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Fig. 6. (A) Serial transverse sections indicate the expression of Isl1, Nkx2.5, GATA4, GATA5, GATA6b, Xmsr and Flk1 in Xenopus laevis embryos at stage 30/31. (B) Spatial expression of Tbx20, Tbx1, Tbx5, BMP2, BMP4, Dkk1 and FGF8b at stage 30/31. The upper row provides a lateral view. Dashed lines depict the level of sections A, B and C as indicated. Level A corresponds to the anterior region of the heart. Level B is at the level of the closing heart tube. Level C is at the posterior end of the heart where the IFT forms later in development. |