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a) Flow cytometry gating strategy for isotype-switched memory B cells in PBMC. (b) Kinetics of S- (left) and influenza virus hemagglutinin- (right) binding memory B cells, gated as in (a) and Fig. 3a, in PBMCs from convalescent patients collected at the indicated days post onset of symptoms. Symbols at each timepoint represent one sample (n=18). Data from the 7-month timepoint are also shown in Fig. 3b.
