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CD69 expression by T lymphocytes upon S. aureus SAg challenge. CD69 expression was measured on T lymphocytes (CD3+) after 24 h of incubation with 1.0 μg/ml of SSAgs (black bars) and 0.1 μg/ml of SSAgs (white bars) of whole blood, Eagle's minimal essential medium (negative control; RPMI [gray bar]), or 10 μg/ml PHA (positive control; gray bar). Results are means ± standard deviations (n = 3).
