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Baculovirus-mediated expression of β-Gal activity in strain 293 cells infected with different constructs (Bac-ITR, Bac-ITR/RepS, and Bac-ITR/RepA) at MOIs of 50 and 100. Infection of 293 cells, preparation of cell extracts, and the β-Gal assay were carried out as indicated in Materials and Methods.
