| identification of two groups of mycobacterium paratuberculosis strains by restriction endonuclease analysis and dna hybridization. | genomic dna was prepared from four reference strains of mycobacterium paratuberculosis and 46 isolates of this organism from new zealand, australia, canada, and norway and also from two mycobactin-dependent "wood pigeon" strains. the dna was characterized by restriction endonuclease analysis, both with and without dna hybridization, with a probe specific to a repetitive dna sequence in m. paratuberculosis. both techniques differentiated m. paratuberculosis strains into two groups, but dna hybrid ... | 1990 | 2166089 |