Ribosomal Ribonucleic Acid Cistron Similarities and Taxonomic Neighborhood of Brucella and CDC Group Vd De Ley, J. and Mannheim, W. and Segers, P. and Lievens, A. and Denijn, M. and Vanhoucke, M. and Gillis, M.,, 37, 35-42 (1987), doi = https://doi.org/10.1099/00207713-37-1-35, publicationName = Microbiology Society, issn = 1466-5026, abstract= Hybridizations were performed between labeled ribosomal ribonucleic acids from Brucella abortus ATCC 23448T(T = type strain) and from several other organisms on the one hand and deoxyribonucleic acids from type and representative Brucella strains and from many other gram-negative organisms on the other hand. Brucella forms a tight cluster, with deoxyribonucleic acid homologies close to 100%; its closest neighbors are CDC group Vd, followed by Phyllobacterium. This Brucella ribosomal ribonucleic acid branch links most closely at about 73.1°C Tm(e) with the Agrobacterium-Rhizobium cluster, which is itself a member of ribosomal ribonucleic acid superfamily IV. The deoxyribonucleic acid base compositions of Brucella 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 × 109to 2.82 × 109., language=, type=