RB1 and infection: However, preservation of LCMV-NP396–404 specific CD8 T cells following early Rb treatment resulted in increased NP396–404-specific lysis (CTL) at day 9 post-infection (likely reflecting the increased number of NP396–404-specific cells), whereas this treatment had a minimal effect on the LCMV-GP33–41 specific CTL activity (Figure 2C).