ADAMTS10 and Williams syndrome: In their study, which identified the chromosomal location of the gene causing autosomal recessive WMS, later identified as ADAMTS10, Faivre et al. [13] report that two out of three patients in family 1 had mild pulmonary stenosis, and the two affected individuals of family 2 had aortic and pulmonary stenosis with dysplastic valves and hypertrophic obstructive cardiomyopathy.