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Fig. 9. Gastrulation and formation of the endomesoderm requires downregulation
of TCF. (A) Scheme of the experiment. (B-R) Embryos were
injected at the egg stage and treated continuously with Dexamethasone (DXM)
starting either at the egg cell stage (C,G,K,P),or at the hatching Blastula
(D,H,L,Q) or the early mesenchyme Blastula (vemB) stage (E,I,N,R). The
morphology of the embryos is documented in B-E. (F-R) In situ hybridization
with the probes indicated on the left. (B,F,J,O) Control embryos. vv, vegetal
pole view.