Relative expression of activation, trafficking, and naive/memory markers expression in different subpopulations of CD3⁺ T cells. Mean percentages of CD69, CD62L, CD45RA, and CCR7 are compared between different T-cell subsets (SP, DP) and between age groups. Bars represent mean values of 3 to 4 macaques plus or minus SEM. * indicates significant differences between group A (0- to 3-day-old) and B (12- to 21-day-old) neonates for the specified T-cell subsets.