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Percent cytotoxic T lymphocyte responses in volunteers given a vaccinia virus mutant (NYVAC) containing HIV clade C genes alone or preceded by priming with a DNA plasmid containing the same genes, showing the enhancement by the prime-boost strategy. ELISPOT, enzyme-linked immunospot. (Reprinted from reference 46 [originally published in J. Exp. Med. doi:10.1084/jem.20071331] with permission of the publisher.)
