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Molecular phylogenetic trees were reconstructed from nucleotide sequences of nifH and 16S rDNA for Frankia and of rbcL for actinorhizal plants. Comparison of Frankia phylogenetic trees reconstructed using nifH and 16S rDNA sequences indicated that subgroupings of both trees correspond with each other in terms of plant origins of Frankia strains. The results suggested that 16S rDNAs can be utilized...