National Library of Medicine: OS - http://www.nlm.nih.gov/mesh/jablonski/syndromes/syndrome498.html Opitz syndrome, the synonyms, a summary and a list of major features.
Status Code: 301 - Location: http://www.nlm.nih.gov/archive/20061212/mesh/jablonski/syndrome_title.html
NORD: Opitz Syndrome - http://www.nlm.nih.gov/mesh/jablonski/syndromes/syndrome498.html A look at the alternate names, a general discussion and resources.
Zach's Opitz Syndrome Site - http://www.nlm.nih.gov/mesh/jablonski/syndromes/syndrome498.html Offers information, a family's experience with this syndrome and links to the Opitz Family Network.