Saturation curves indicating β-AR expression in T cell subsets. Mean (± SEM) specific binding of β-AR agonist ¹²⁵I-cyanopindolol (¹²⁵I-CYP) per 100 000 cells at different ¹²⁵I-CYP concentrations; n = 6. β-AR expression is greater in CD62L⁻ (●) than CD62L⁺ (○) T cells and in CD8⁺ (B) than CD4⁺ T cells (A). Values of specific binding were obtained by subtracting nonspecific binding from total binding. Table 2 contains B_max values.