HLA-DR4 References HLA-DR4 genetics Ask Anything Homework Help Written by The Information Architects of Encyclopaedia Britannica The Information Architects maintain a master list of the topics included in the corpus of Encyclopædia Britannica, and create and manage the relationships between them. The Information Architects of Encyclopaedia Britannica Britannica AI Ask Anything Learn about this topic in these articles: arthritis/ Spondyloarthropathies…if the patient has the HLA-DR4 genotype. Read More…if the patient has the HLA-DR4 genotype. Read More