SUMMARY: The cell wall compositions of 41 strains of oral filamentous bacteria belonging to the genera and were examined by paper chromatography. walls showed principally alanine, glutamic acid, DAP, glycine and aspartic acid. The genus had the same amino acids but aspartic acid appeared to be a minor component and was not detected in the mucopeptide fraction of the cell walls. The strains of Fusobacterium gave an amino acid pattern characteristic of Gram-negative bacteria; however, lysine was a major component in the mucopeptide. The genus is thus distinct from the other two genera and should include two species, and another organism termed ‘Anaerobic filaments’.


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