B cells were isolated using the human B cell isolation kit II (Miltenyi Biotech, Bergisch Gladbach, Germany). Isolated B cells were stimulated with LPS (10 μg/ml) or CpG ODN2006 (10 μg/ml) alone or combined with human CD40L (1 μg/ml) for either 24 h (for co-culture experiments) or 72 h (for recovery of supernatants) at 37°C and 5% CO2.
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