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Plaque morphology of viruses containing second-site reversions. L cells were infected with cell lysate stocks of viruses with second-site reversions alone or in combinations in E89A (A), E89Q (B), or wild-type (C) μ1 backgrounds and overlaid with agar-medium mix containing CHT. At 4 days postinfection, cells were fixed with 10% formaldehyde and stained with crystal violet.
