GZMB and infection: These included non-persisting infection with attenuated N-tropic F-MLV (F-MLV-N) (Dittmer et al., 1998) or transient env124–138 peptide immunization, which failed to induce GzmB+ cells, and transplantation of the FV-induced FBL-3 tumor cell line (Klarnet et al., 1989), which induced moderate levels of GzmB+ cells (Figure 1E).