More than one mutation in this line results in a discernible phenotype in a homozygous recessive screen. At least two segregating phenotype groups are identified. See b2b1879.1Clo and b2b1879.2Clo
Summative Diagnosis:
Mutant Type 1:
Cardiovascular Phenotype: Overriding aorta/Double outlet right ventricle (DORV) with ventricular septal defects (subaortic, perimembranous, and muscular), atrioventricular septal defects (AVSD), and biventricular hypertrophy
Noncardiovascular Phenotype: Abnormal flexure of the hindlimbs, hydrops, midline fusion defect of the sternal vertebra, hypoplastic thymus, short snout, and cleft palate

Mutant Type 2:
Noncardiac phenotype: Kidney agenesis

Fyler Codes
The Fyler code developed by The Boston Children's Heart Foundation in Boston Children's Hospital provides a hierarchical clinical diagnosis of congenital cardiovascular defects and other disorders. These codes are used to delineate pathology in the mutant mouse models that parallel human disease and can be cross referenced to the International Pediatric and Congenital Cardiac Code (IPCCC) (http://www.ipccc.net/).

Fyler Code ID	Code Description
0600	Double outlet right ventricle
0606	DORV + AVSD (AV canal)
1100	Atrioventricular canal (endocardial cushion defect)
1300	Ventricular septal defect
1310	Ventricular septal defect, membranous
1320	Ventricular septal defect, muscular
1432	Overriding aortic valve
4100	Skeletal, skin, muscle anomaly
4876	Cleft palate
4906	Non-cardiac abnormality
7505	Biventricular hypertrophy
4503	Agenesis of kidneys