Figure 4From: Effect of ageing on CMV-specific CD8 T cells from CMV seropositive healthy donorsExpression of CD27 and CD28 on the effector-memory CD8 T cell subsets. EM CD8 T cells defined as CCR7null were subdivided into further subsets according to the model in Figure 1 and analysed in young, middle aged and elderly individuals. Columns and bars represent the mean and SD.Back to article page