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The phylogenetic position of Acidaminococcus fermentans was determined by comparative sequence analysis of the 16S rRNA. This Gram-negative bacterium is a member of the Sporomusa cluster that is defined by other Gram-negative bacteria, i.e. Sporomusa, Megasphaera, Selenomonas, Butyrivibrio, Pectinatas, and Zymophilus. The branching point of this group within the radiation of Gram-positive bacteria of the Clostridium/Bacillus subphylum and adjacent to Peptococcus niger could be confirmed. Chemotaxonomic data were provided for a more detailed characterization of A. fermentans.
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Both et al. (1992) studied this question.
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