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Thin sections of Sf9 cells expressing wild-type Pr55 (top panel) or Pr55 bearing the Tyr79Ala change in the MA domain (bottom panel). Compared to the wild type, Tyr79Ala produced deformed, only partly budded particles and an accumulation of Gag antigen at the membrane typical of other virus assembly mutants previously described (reference 17 and references therein).
