Canadian Opitz Family Network
   A description of Opitz G/BBB Syndrome.
   http://www.apollos.net/arena/opitz/definition.html

Family Village
   Opitz G Syndrome information and contact links.
   http://www.familyvillage.wisc.edu/lib_optz.htm

NORD: Opitz Syndrome
   A look at the alternate names, a general discussion and resources.
   http://www.rarediseases.org/search/rdbdetail_abstract.html?disname=Mannosidosis

National Library of Medicine: OS
   Opitz syndrome, the synonyms, a summary and a list of major features.
   http://www.nlm.nih.gov/mesh/jablonski/syndromes/syndrome498.html

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.
   http://www.opitznet.org

Zach's Opitz Syndrome Site
   Offers information, a family's experience with this syndrome and links to the Opitz Family Network.
   http://www.opitzsyndrome.com