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Phylogenetic affiliation of representative δ-proteobacterial clones from density-resolved rRNA extracted from [13C]propionate-consuming anoxic rice field soil relative to members of the δ-Proteobacteria. X3Ba clones, “heavy”; X9Ba clones, “light.” Numbers in parentheses (base pairs) indicate expected T-RFs of clones. The scale bar represents 10% sequence divergence. GenBank accession numbers of reference sequences are given.
