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Plasmid megaplasmids and chromosomes as visualized by the modified Eckhardt procedure. Lanes: 1, B. abortus bv. 1; 2, B. melitensis bv. 1; 3, B. abortus bv. 4; 4, B. suis bv. 3; 5, B. suis bv. 4; 6, B. suis bv. 5; 7, R. etli CFN42; 8, R. meliloti 1021; 9, R. tropici type A reference strain CFN299.
