Table 1.

Summary of ultrasound scanned embryos at E11.5 and E12.5

Stage	Litters	Number of Embryos		Phenotype Found in the Mutants
		Total	Mutant	Reverse Flow	Dead/Dying	Normal
E11.5	10	82	23 (28%)	12 (52%)	3 (13%)	8 (35%)
E12.5	5	33	11 (33%)	3 (27%)	8 (73%)	0 (0%)

A total of 3 embryos out of 20 living mutants at embryonic day (E) 11.5 showed arrhythmia: 2 with arrhythmia and reverse blood flow (10%) and 1 with arrhythmia but with normal blood flow (5%). The 3 living mutant embryos at E12.5 showed normal rhythm.