Southern hybridization of isolates of three STs (given above the lane numbers) with ISBcen20 (A) and ISBcen8 (B) probes. Samples are as follows: lanes 1, J2315; lanes 2, BCC0313; lanes 3, BCC0162; lanes 4, BCC0163; lanes 5, BCC0164; lanes 6, BCC0077; lanes 7, BCC0575; lanes 8, BCC0107; lanes 9, BCC1168; lanes 10, BCC0078; lanes 11, BCC0534; lanes 12, BCC0222; lanes 13, BCC0223; lanes 14, BCC0536; lanes 15, BCC0541; lanes 16, BCC0514; lanes 17, BCC0098. The approximate positions of the molecular size markers (in kilobases) from the agarose gel electrophoresis of the DNA are indicated to the left of each gel.