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Expression of SIV Gag protein in Vero cells infected with rNDV/SIVgag virus. rNDV/SIVgag virus-infected cells were fixed at day 2 postinfection, and permeabilized cells were used for immunofluorescence analysis. SIV Gag protein expression was evidenced by using anti-SIV Gag monoclonal antibody, as described in Material and Methods. Vero cells infected with wild-type rNDV/B1 virus were used as negative controls.
