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Smith-Lemli-Opitz syndrome
Background
Smith-Lemli-Opitz syndrome (SLOS) is a congenital syndrome that was first described in 1964. It is due to deficiency of the enzyme called 7-dehydrocholesterol reductase (DHCR7). The estimated incidence of SLOS is between 1 in 20,000 to 1 in 40,000 live births, but may be higher.