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Fig. S5
BMP signaling is active in the ventral-posterior tailbud. (A,B) Confocal microscopy images of tailbud in wild-type and mfn embryos labeled with β-catenin (red) and P-Smad5 (green) antibody at 21 somites. Note that in wild-type embryo (A), P-Smad5 staining is expressed in the posterior tailbud and extends under the notochord, whereas it is absent in mfn (B).
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