CD3, CD2, and CD21 expression on NC5 and TC cell lines. One EBV B-cell line (negative dotted line), Jurkatt T-cells (thick black line), and the EBV-transformed T-cell lines NC5 and TC (positives dotted lines) were analyzed for expression of the CD2 and CD3 T-cell–specific antigens. The isotype control is shown as a straight black line. In addition, the EBV B-cell line and the two EBV-transformed T cells, NC5 and TC, were analyzed for the expression of CD21. The different histograms for the three different lines were completely indistinguishable.