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Gating strategy. FACS plots depict the gating strategy for the identification of (A) total memory B cells (CD19+CD24+CD27+) and (B) inside memory B cells with low and (Spike-PE, S+) high binding capacity (Spike-PE and Spike-BUV395, S++) and (C) receptor binding domain–specific memory B cells. RBD, receptor-binding domain.
