To determine whether the effects of Bcl-xL occurred early or late in the neoplastic process, we examined sections of pancreases from RIP-Tag; RIP-tva mice at 2 and 5 wk after RCASBP-Bcl-xL delivery (9 and 12 wk of age, respectively), as well as 9 wk after infection (Figure 5B and 5C). The gene discussed is BCL2L1; the disease is infection.