B. burgdorferi plasmids present in four isolates.

aPlasmids known to be in some cultures of the indicated strain, but which were not present in the sequenced culture. Their sequences remain undetermined.bStructural differences from otherwise organizationally similar plasmids are indicated as follows: trunc, truncated compared to other homologous plasmids; int, B31 cp32-10 is integrated into plasmid lp56; fused, JD1 cp32-1 and cp32-5 are fused into one large circular “cp32-1+5” plasmid.cIn some B31 cultures the plasmid cp32-7 is replaced by cp32-2 [12]. These two plasmids have the same apparent compatibility and appear to be prophage DNAs. Since it seems unlikely that they can exist in the same cell, and they are expected to be able to move between strains, one of them may have been inadvertently introduced in the laboratory. We use cp32-7 for this compatibility type since it is the one that is present in the completely sequenced B31 genome.