Extended Data Fig. 10: Comparison of CD4 and CD8 TCR repertoires between young and old donors before and after vaccination.

(a) Diversity estimation of CD4 TCR repertoire in young (n = 3) and old (n = 3) donors before and after vaccination (7 days after the second dose). Higher value for greater diversity. *: p < 0.05; **: p < 0.01; ***: p < 0.001; ns: not significant. Wilcoxon Rank Sum test (two-sided). (b) Clonotype expansion of the top 40 CDR3 clonotypes for CD8 TCRα, CD4 TCRα, CD4 TCRβ for young and old groups before and after vaccination (7 days after the second dose).