Fine map of a public antibody epitope supports α-helical conformation for the H3′ segment of HLA DR β-chain: [formula omitted], J Dowd †, A Hletko ∗, D Karp † and J Gorski ∗. Dept. of Pathology, Emory Univ Sch Med, Atlanta GA, †Simmons Arthritis Research Ctr, Univ Texas Southwestern Med Ctr, Dallas TX ∗ Immunogenetics Research Blood Research Institute, Milwaukee