Agarose gel of plasmid DNA from B. burgdorferi clones with normal cp26 and cp26*. Plasmid preparations from the indicated strains were separated by electrophoresis through a 0.3% agarose gel and stained with ethidium bromide. cp26 and cp26* are indicated by white circles and asterisks, respectively, to the left of the bands. Lanes: M, markers (sizes in kilobases); 1, B31; 2, B31-9; 3, B31-82; 4, B31-34.