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Wnt inducibility of the Siamois promoter. Embryos were microinjected in two ventral animal blastomeres with −833pSia-Luc (A), −245pSia-Luc (B), and −135pSia-Luc and −296pSia-Luc (C). Luciferase activity was measured for embryos injected with promoter constructs alone, or coinjected with Xwnt8 ± DN, tBr, or Xnr3 mRNAs as shown.
