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H1N1 Ag-stimulated IgG responses in HC and HIV-infected patients pre- and post-H1N1 vaccination: H1N1 vaccine Ag-stimulated IgG ASC with and without exogenous IL-21 at T0 and T2. Box plots include median with 25th and 75th percentile borders, and error bars represent 10th and 90th percentiles. Stars indicate the level of significance. ★p < 0.05, ★★p < 0.01, ★★★p < 0.001.
