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Eckhardt gel showing plasmid profiles of S. meliloti strains with deletions in pRme2011a. Lanes: A, R. leguminosarum LRS39501 (24) (size standard); B, Rm2011; C, SmA818; D, SmA146; E, Rm2011. All lanes are from the same gel, but some intervening lanes showing derivatives with smaller deletions have been removed for clarity.
