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Effect of IFN-γ pretreatment on HSV-1 plaques following direct infection of ECs. (A) Two moderate-sized cytopathic plaques (arrowheads) produced by HSV-1 infection in ECs that were not treated with IFN-γ. Magnification, ×194. (B) Small cytopathic plaque (arrowhead) in ECs treated with IFN-α and -γ. Magnification, ×194.
