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The effect of the gE/gI- and gE/gI/TK-gene-deleted PRV on histopathology in the brain and lung tissues of pigs. (A,B) HE staining was carried out to measure pathological lesions of brain and lung tissues in pigs. Scale bar, 50 or 100 μm. Arrows indicate the cell infiltrates. HE, hematoxylin and eosin staining.
