HLA B27 is positive in
Ref Robbins 8/e p193; Harrison 17/e p2051 ;9/e p215 The HLA complex, which is located on the sho arm of human chromosome 6, contains sequences encoding about 100 genes, most involved in the regulation of the immune response. HLA genes are classically grouped into three major classes.
Ankylosing spondylitis
Rheumatoid ahritis
SLE
Behcet syndrome
General anatomy