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MRKAd5 and MRKAd6 trigene vaccine constructs. The HIV nef-gag/pol expression cassette (lower diagram) was added to both the MRKAd5 and MRKAd6 vectors. ITRL, inverted terminal repeat (left); ITRR, inverted terminal repeat (right); BGH, bovine growth hormone; pA, polyadenylation signal sequence; SV40, simian virus 40.
