SARS-CoV-2 B-cell memory. (A) Bar graphs show the number of clonotypes in each patient after the vaccination. (B) Pie charts for IGHV show the distribution of antibody sequences of individuals before the vaccination and after 7 days and 4 to 5 weeks. The number of sequences analyzed for individual are shown in the inner circle. Sizes of pie slices are proportional to the number of clonally related sequences. Persisting clones (same IGV genes) in both time points are shown as colored slices. Gray indicates sequences not overlapped between individuals.