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Plaque morphologies of PRV strains with insertions in gG in the presence or absence of gE and gI. Forty-eight hours after infection with the indicated virus strain, MDBK cells were either fixed and stained with 0.5% methylene blue in 70% methanol or examined by fluorescence microscopy for EGFP expression. (A) egfp insertions in gG (Us4) in the presence of gE and gI. (B) egfp insertions in gG (Us4) in the absence of gE and/or gI.
