Mouse model of congenital heart disease. This model has a deletion of the NK2 specific domain of the Nkx2.5. Taken from a null embyronic day 12.5 mouse. For more information see http://cardiogenomics.med.harvard.edu/groups/proj1/pages/nk2-sd_home.html. Keywords = congenital heart disease, Csx, Nkx2.5