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SUMMARY: By extracting the capsular material of Bacillus M with hot water, d-glutamic acid polypeptide and a polysaccharide were isolated. The polypeptide absorbs the antibody from an anthrax immune serum, which reveals a homogenously distributed capsular material in Bacillus M. The polysaccharide absorbs one of the homologous antibodies, which renders a characteristic structure visible in the capsule and gives a specific cell-wall reaction. By using lysozyme digestion for the dissolution of the capsule or of the cell-wall a mucoprotein was isolated. The mucoprotein gives serological reactions identical with those of the polysaccharide, and it corresponds to a less degraded form of the cellular substance participating in building up both the cell wall and the capsular structure.
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