Hybridizations were performed between labeled ribosomal ribonucleic acids from ATCC 23448(T = type strain) and from several other organisms on the one hand and deoxyribonucleic acids from type and representative strains and from many other gram-negative organisms on the other hand. forms a tight cluster, with deoxyribonucleic acid homologies close to 100%; its closest neighbors are CDC group Vd, followed by This ribosomal ribonucleic acid branch links most closely at about 73.1°C with the cluster, which is itself a member of ribosomal ribonucleic acid superfamily IV. The deoxyribonucleic acid base compositions of strains range from 57.9 to 59.2 mol% guanine plus cytosine; the average genome molecular weights of the six species range from 2.37 × 10to 2.82 × 10.


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