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Plasmid profiles. Lanes: 1, Pseudomonas sp. strain ADP (31), 2, Atr− strain of Pseudomonas strain ADP, 3 and 4, transconjugants 3A and 3B from the mating of ADP with E. coli strain AD256. The values to the right of the gel are mean molecular masses in kilobases determined with reference to plasmids from Sinorhizobium strains (36).
