The FACS images show an example of staining of asymptomatic atopic (AA) PBMCs with anti-CLA (FITC, x axis) and tetramer (PE, y axis). (a) Data for the EBV BMLF1 A*0201 tetramer. (b) Data for the P6 A*0201 tetramer with the percentage of tetramer-binding cells that are CLA shown in the top right-hand corner of each image.