Logo plots of the CDRH2 domain of the VH1-18 QxxV class precursors enriched in the GCs at 15 and 28 days post immunizations with H3ssF or H7ssF (see also Figures 3F–3K; 167 GC BCRs for H3ssF at day 15 [n= 3 mice], 125 GC BCRs for H3ssF at day 28 [n= 3 mice], 99 GC BCRs for H7ssF at day 15, 111 GC BCRs for H7ssF at day 28 [n= 3 mice]; one experiment).