ERAP2 is associated with ankylosing spondylitis in HLA-B27-positive and HLA-B27-negative patients. Issue 8 (27th April 2015) - Robinson, Philip C; Costello, Mary-Ellen; Leo, Paul; Bradbury, Linda A; Hollis, Kelly; Cortes, Adrian; Lee, Seunghun; Joo, Kyung Bin; Shim, Seung-Cheol; Weisman, Michael; Ward, Michael; Zhou, Xiaodong; et al.