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Structure of perinuclear (A and B) and extracellular (C and D) virions of PrV-Ka (A and C) and PrV-ΔUL46-49 (B and D). Ultrathin sections were prepared 12 h after infection of RK13 cells at a MOI of 1, counterstained with uranyl acetate, and examined by electron microscopy. Bars, 150 nm.
