RT Journal Article SR Electronic T1 The HLA System JF Annals of the Rheumatic Diseases JO Ann Rheum Dis FD BMJ Publishing Group Ltd and European League Against Rheumatism SP 581 OP 581 DO 10.1136/ard.38.6.581-a VO 38 IS 6 A1 G. D. Pegrum YR 1979 UL http://ard.bmj.com/content/38/6/581.1.abstract AB