Expression of CD69 and BLT1 (LTB₄ receptor) on T and NK cells and BLT1 on B cells. Expression of CD69 and BLT1 was registered by flow cytometry, using double staining. The numbers denote the percentage of positive cells in the indicated cell categories. Uninfected CBMCs and EBV-infected CBMCs were cultured for 6 days. (A) CD69 expression on CD3⁺ T cells and CD56⁺ NK cells. BLT1 expression on CD3⁺ T cells, CD56⁺ NK cells, and CD19⁺ B cells. The results show 1 representative of 4 independent experiments. The cell composition of the cultures is given in Table 1. (B) BLT1 expression on CD3⁺, CD4⁺, and CD8⁺ T cells.