Here is something that may help...or maybe confuse you even more. I certainly don't understand it. At Dr. Fine's conference this past Spring he said it took him a long time to understand the genetics.
http://www.enabling.org/ia/celiac/cel-hla.html#Q8
In reading this DR4 only accounts for a small percent of people with CD.
Here is an abstract that mentions DR4 and celiac
http://www.ncbi.nlm.nih.gov/entrez/q...t_uids=8851726
this is confusing.
Anne