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PAGE analyses of rhamnan-containing LPSs present in the aqueous phases of hot phenol-water extracts of Rhizobium sp. strain NGR234 and regulatory mutants involved in transcriptional control of rhamnan production. All cultures were induced with apigenin. Lanes contain extracts from the following sources: 1, wild-type NGR234; 2, NGRsyrM2::uidA; 3, NGRΩnodD2; 4, NGRΩttsI. The position of the rhamnan-containg LPS is indicated in lanes 1 to 3. The gels were silver stained for LPS.
