Examples of IS-RFLP profiles obtained after EcoRI or EcoRV digestion of the genomic DNA of various Y. pseudotuberculosis strains and hybridization with the IS285 and IS1541 probes, respectively. Lane 1, IP32879; lane 2, IP30911; lane 3, IP32614; lane 4, IP32938; lane 5, IP32984; lane 6, IP31554; lane 7, IP32953; lane 8, IP32581; lane 9, IP31411; lane 10, IP32721; lane 11, IP33051; lane 12, IP32817. The tick marks between the two panels indicate the size of the molecular mass markers (lambda DNA-HindIII digest) in kb.