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We propose to maintain the genera Buttiauxella and Kluyvera, which are phenotypically similar, as separate genera in the Enterobacteriaceae. This separation is supported by the following findings: (i) strains of Kluyvera ascorbata and Kluyvera cryocrescens were related to Buttiauxella agrestis ATCC 33320T (T = type strain) at levels of 32 to 36% and 30 to 31%, respectively, as determined by deoxyribonucleic acid relatedness (nitrocellulose filter method at 52.8°C); (ii) the guanine-plus-cytosine ratios of Buttiauxella and Kluyvera deoxyribonucleic acids 48 to 50 mol% and 55 to 57 mol%, respectively; and (iii) production of indole and lysine decarboxylase and fermentation of sucrose in 2 days could differentiate Kluyvera from Buttiauxella.
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