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Variation of the B. abortus 2308 strains re-isolated via in-vivo passage in mice. Three of the 12 isolates were found to have increased to two TRs copy numbers at Hoof 3. In the rest of 16 loci, no change was detected. M, 25/100 bp ladder; 1, B. abortus 2308 strain; 2-13, B. abortus 2308 mouse passage isolates.
