Table 2. .

Penetrance of the Craniofacial Phenotype in Different SMS Mouse Models in a Pure Isogenic C57BL/6 Background

		No. of Mice
Strain Genotype	Generation	Examined	With Phenotype	Penetrance (%)
Df(11)17/+	N8	49	47	96
Df(11)17-1/+	N6	30	30	100
Rai1−/+	N6	28	18	64