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ELISPOT responses in BALB/c mice immunized with Δ4SHIVKU2 DNA. The number of IFN-γ-producing cells per million splenocytes from groups of mice injected with different doses of DNA was counted in an ELISPOT assay. The group receiving 200 μg DNA had significantly higher (P < 0.05) ELISPOT counts than the group receiving 100 μg DNA. Error bars indicate standard deviations.
