Lymphocytes, from randomly selected individuals having normal immune function, when incubated in vitro with varying concentrations of streptococcal antigens, responded in three ways: (a) response over the entire antigen concentration range, i.e., responders; (b) low response to only the highest antigen concentrations; and (c) no response at any antigen concentration. Frequency distribution analysis of these groups indicated that a significant association occurred between the ability to respond and HL-A 5.
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