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Fig. 6. Tbx expression in Bmp2 CKO mutant embryos at 9.5 dpc.
Tbx2 mRNA expression is located in the myocardium of the AV canal in
wild-type embryos (A) but is not present in the mutant (B, indicated by
arrow). Other Tbx genes, including Tbx5 and Tbx20,
are expressed in the myocardium of the atrium and ventricle in wild-type
embryos (C,E) and also in the Bmp2 CKO mutant embryos (D,F). Arrows
denote hybridization signal. a, atrium; ba, branchial arch; v, ventricle.