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Activated T cell responses towards ancestral and beta RBD-derived peptides. Proportion of CD134+CD137+ and CD69+CD137+ activated cells of the total CD4+ and CD8+ T cell population, respectively, following AIM assay with RBD-derived peptides from ancestral and beta strains. Green (d1) and black (d29) circles depict GM datapoints. Numbers depict d29:d1 GMFR.
