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Durability of epitope-specific cellular immune responses. Groups of C57BL/6 mice (n = 4/group) were immunized i.m. once with 50 μg Gag WT or Gag dAL11 DNA vaccine. AL11- and KV9-specific CD8+ T-lymphocyte responses (A) and DD13-specific CD4+ T-lymphocyte responses (B) were assessed by IFN-γ ICS assays 6 months after immunization. Error bars indicate standard errors.
