Fig. 3
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pitx2 expression in Xenopus is activated in response to Nodal. (A) Animal cap assay showing induction of pitx2 expression in response to Xnr-1 overexpression. Embryos at the four-cell stage were microinjected at the animal pole in each blastomere with 50 pg of Xnr-1 mRNA. Animal caps were removed at stage 7, treated continuously with 10 μg/ml cycloheximide, and analyzed at stage 9 in parallel with untreated control caps for the expression of Xbra, goosecoid, pitx2b, pitx2c, and histone H4. While Xnr-1 induces Xbra and goosecoid expression in absence of protein synthesis, treatment with cycloheximide prevents the strong activation of pitx2c and pitx2b expression. |
Reprinted from Developmental Biology, 229(2), Faucourt, M., Houliston, E., Besnardeau, L., Kimelman, D., and Lepage, T., The pitx2 homeobox protein is required early for endoderm formation and nodal signaling, 287-306, Copyright (2001) with permission from Elsevier. Full text @ Dev. Biol.