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Western analysis to detect restoration of BrkA expression in B. bronchiseptica. Lanes: 1, B. bronchiseptica RB50 control; 2, B. bronchiseptica 213; 3, B. bronchiseptica 11OH; 4, RB50 gentamicin-resistant pUW2171 transconjugant. Approximate molecular masses are indicated in kilodaltons.
