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Fractionation of the biomass of 3 serogroup B N. meningitidis strains, obtained from solid serum-free and liquid synthetic media, by increasing concentrations of cetavlone revealed that the formation of natural polysaccharide-protein complexes with the ratio of their components approaching 1:1 was possible under the conditions ensuring the intensive synthesis of capsular polysaccharide. Two strains, 125 and 1642, grown on a solid amino peptide-containing medium regularly produced two polysaccharide-protein complexes with the protein/polysaccharide ratio approaching 1:1. One of these complexes passed easily into the supernatant fluid and could be precipitated with 0.1% cetavlone. The second complex was more firmly bound to the outer membrane of the cell and could be precipitated with 1% cetavlone. In most experiments an additional fraction with high protein content in relation to sialic acid was isolated from the biomass.
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