(A) Breeding scheme demonstrating nondiabetic WT males crossed with nondiabetic (normoglycemic) and diabetic (hyperglycemic) Notch1+/– females. (B–E) Representative H&E-stained images showing the location of ventricular septal defects (*) in E13.5 WT and Notch1+/– hearts exposed to maternal diabetes as compared with nondiabetic WT and Notch1+/– controls. RA, right atrium, LA, left atrium; RV, right ventricle; LV, left ventricle. Scale bar: 200 μm.