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Superantigen antagonist activity of B7-2 homodimer interface mimetic peptide pB2-7. PBMCs were incubated with 0.01 ng/mL SMEZ (Left) or TSST-1 (Right) alone or together with 0.1 μg/mL pB2-7 or 0.01 μg/mL each pB2-4 and pB2-6. Secreted cytokines were determined.