Fig. 7. Effects of BMP inhibition in combination with FGF in Xenopus. Embryos were injected into the A4 blastomere at the 32-cell stage. FGF4 in combination with cSmad6 does not induce brachyury in prospective ventral ectoderm cells at stage 10+ (A-C). Neither FGF8 nor FGF4 is able to induce Sox3 in the ventral epidermis cells of early neurula stage embryos (D-I), while misexpression of FGF4 together with Smad6 induces a patch of Sox3 (J-L). (A,D,G,J) Dorsal views; (B,E,H,K) ventral views of same embryos, which are shown again in C,F,I,L after anti-fluorescein staining.