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

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

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

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

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

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

A-Z Deafblindness An in depth article by Mary Guest, Head of Usher Services at Sense, about Usher syndrome. Includes detailed description of what it is, the symptoms, genetics, transmission, the problems associated with it and what can be done. http://www.deafblind.com/usher.html