Figure 4
From: Independent evolution of neurotoxin and flagellar genetic loci in proteolytic Clostridium botulinum
Restriction digests of plasmids carried by four strains of proteolytic C. botulinum. Ethidium bromide-stained agarose gel photographed under UV light showing plasmid DNA extracted from four strains (indicated at bottom) following digestion with different restriction endonucleases (indicated at top). The plasmids carried by strains ATCC 3502 and by F9801A are clearly closely related or identical (see Figure 3). Lanes containing size markers (up to 10 kilobase pairs, kbp) are labelled M.