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Plasmid profiles of isolates resulting from conjugation and transformation experiments. Lanes 1 and 8, supercoiled DNA ladder (Gibco BRL); lane 2, E. coli 39R861; lane 3, Salmonella serotype Infantis UCM267; lane 4, E. coli transconjugant; lane 5, E. coli recipient K-12 20R764; lane 6, E. coli transformant; lane 7, E. coli recipient DH10B. Sizes are expressed in megadaltons.
