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Fig. 7. Ventricular septal defects. (A-C) Transverse sections through hearts of E14.5 PDGFR{alpha}fl{Delta}/fl{Delta}; Wnt1Cre+ embryos. (A,B) Sections through region of membranous ventricular septum. (C) More caudal section through the heart of embryo in B but containing an intact muscular ventricular septum. a, atrium; s, septum; vsd, ventricular septal defect.