Differential CD57 expression on HIV-1-tetramer⁺ CD8⁺ T-cell memory subsets. (A) CD57 expression on 2 HIV-epitope specific CD8⁺ T-cell responses in subject 10001. (B) Lower expression of CD57 on human leukocyte antigen B8-FL8⁺ TemRA phenotype cells compared with TemRO phenotype cells in subject 10071. (C) Summary of CD57 expression on different memory populations on total CD8⁺ T cells and HIV-specific CD8⁺ T cells. (D) Distribution of CD57 on different memory subsets on TRBV⁺ and TRBV⁻ HIV-specific CD8⁺ T cells in subject 10071.