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GFP expression by the Salmonella vaccine vector. Recombinant Salmonella expressing GFP (AroC+GFP) or Salmonella carrying an empty plasmid (AroC+pGEM) were grown overnight. GFP expression by the bacteria was determined by sodium dodecyl sulphate-polyacrylamide gel electrophoresis (A) and confirmed by Western Blotting (B).
