Canadian Opitz Family Network: A description of Opitz G/BBB Syndrome.
Family Village: Opitz G Syndrome information and contact links.
National Library of Medicine: OS: Opitz syndrome, the synonyms, a summary and a list of major features.
NORD: Opitz Syndrome: A look at the alternate names, a general discussion and resources.
The Opitz G/BBB Family Network: Online support and information for families with Opitz G/BBB Syndrome. Provides families with easy-to-read information about the syndrome.
Zach's Opitz Syndrome Site: Offers information, a family's experience with this syndrome and links to the Opitz Family Network.