FIG. 3.

Phylogenetic tree of part of the deduced protein sequence (amino acid positions 22 to 127 of strain L2-50) of the butyrate kinase gene (buk) from bacteria examined in this study (shown in boldface) and several clostridial sequences (13, 34, 35, 47). Accession numbers for the sequences used are given in brackets. Bootstrap values greater than 95 (per 100 replications) are shown at branch points. The scale bar represents genetic distance (10 substitutions per 100 nucleotides). *, no corresponding isolate available.