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Cryosections of vaccinia virus-infected HeLa cells were immunogold labeled with antibodies against A33R, A34R, and A36R as indicated in each panel. All three IEV proteins are present in the Golgi apparatus (G in left panels) as well as in IEV particles (right panels). Arrowheads point to IEV particles where the surrounding membranes are clearly visible. Unlabeled IMV particles are indicated by asterisks. Bar, 150 nm.
