CNTN2 and infection: Following multiple rounds of T cell receptor (TCR) triggering, HTLV-1 infected T cells [Tax+ cells; blue] persisted for 21–28 days without a significant reduction in cell number, (P<0.05) (Fig. 1B); in contrast, T cells that were not infected [Taxneg cells; black] displayed a reduction in cell number by 14 days post-infection (pi) (P<0.01).