CCNT1 and infection: Following infection with this virus, the Relative Post-Entry Efficiency in TIMI.4 and R1.1 mouse T-cells was 62- to 65-fold lower compared to human MT-4 (Fig. 7C) or Jurkat T-cells (data not shown), and thus in a range similar to that seen for the lentiviral vector (55- to 235-fold; Fig. 2C), despite the cyclin T1-dependence of gene expression.