Figure 1.

Increasing CD57 expression correlates with increasing differentiation of the CD8⁺ T cell compartment. (A) Correlation of CD57 expression on CD8⁺ T cells with CD8 populations. Grey triangles indicate those RTRs who developed SCC during follow-up. (B) Representative gating indicating the location of all CD8⁺ T cells (black) and CD8⁺CD57⁺ T cells (grey) within CD8 subsets, and frequency of CD57-expressing cells among CD8 populations (stratified by cytomegalovirus seropositivity: non-shaded bars indicate seropositive RTRs). ns, not significant. **P<0.01 using the Kruskal–Wallis with post hoc Dunn’s tests.