Canadian Opitz Family Network 
A description of Opitz G/BBB Syndrome.
http://www.apollos.net/arena/opitz/definition.htmlNational 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
NORD: Opitz Syndrome
A look at the alternate names, a general discussion and resources.
http://www.rarediseases.org/search/rdbdetail_abstract.html?disname=Mannosidosis
