Six deoxyribonucleic acid (DNA)-DNA homology groups within 45 strains of the genus were distinguishable through DNA-DNA hybridizations with four H-labeled reference DNA preparations from type or reference strains of the various known named species. There is good correspondence between two of these DNA-DNA hybridization groups and the species and . Strains named are heterogeneous, comprising three different hybridization groups. One of these groups includes all the strains named and . These results agree precisely with previous results from an immunological study of the two isofunctional enzymes, glucose-6-phosphate dehydrogenase (EC and -lactate dehydrogenase (EC, prepared from NCDO 546 and NCDO 768 (ATCC 12291).


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