Summary: The relationships of 24 strains of 13 species of and 4 strains of were determined by nucleic acid hybridization studies. DNA-rRNA cistron similarity and DNA homology values reveal that is genetically heterogeneous. One cluster contained the type species A second cluster embraced The internal homogeneity of the two clusters was demonstrated by a high similarity in the m menaquinone and fatty acid composition of the strains enclosed. and two strains of were found to be unrelated to each other and could not be allocated to one of the two major clusters. was genetically and phenotypically clearly separated from all species investigated.


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