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Phenotype of Mef2ccre; β-cateninEx3flox mutant embryos. Morphology and serial, transverse sections of 9.5 dpc wild-type (A, C, and E) and Mef2ccre; β-cateninEx3flox mutant embryos (B, D, and F) showing short but more dense and hypercellular OFT myocardium (denoted by black arrows). nt, neural tube; ba, branchial arch; LV, left ventricle; ph, pharynx.
