FIG. 2.

Cytotoxic activities were assayed with CTL obtained by stimulating PBMC of both macaques (C16 [a and c] and C18 [b and d]) with autologous SIV-infected cells after infection, as described in Materials and Methods. Target cells were autologous B-LCLs infected with wild-type vaccinia virus (○) or with Vac-Nef recombinant vaccinia virus (•) (a and b) and incubated with various peptides or without peptide (+) (c and d).