The phylogenetic relationships of the genera belonging to the family were examined by a novel approach, amino acid sequencing of ribosomal AT-L30 proteins. The results of partial amino acid sequencing of AT-L30 preparations revealed that the members of the family are divided into four clusters; the first cluster contains the genus , the second cluster contains the genus , the third cluster contains the genus , and the fourth cluster contains the genera , and , indicating a close phylogenetic relationship between the genera and . The genus is closely related to the genus , and these two genera formed a cluster separate from the clusters for the genera of the . These results agree in almost all respects with previous 16S rRNA sequencing work by Embley et al. (T. M. Embley, J. Smida, and E. Stackebrandt, Syst. Appl. Microbiol. 11:44–52, 1988) and Warwick et al. (S. Warwick, T. Bowen, H. McVeigh, and T. M. Embley, Int. J. Syst. Bacteriol. 44:293–299, 1994), thus supporting the proposal of Warwick et al. that the genera and should be combined in an emended genus. . However, a discrepancy was found between the present study and that of Warwick et al. In the present study, the group and the group were both recovered within the clade for the family .


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