» 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

» 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