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RopA1 orthologs show evidence of multiple recent duplication events. (A) Phylogenetic analysis of RopA1 homologs in various representative Rhizobiales species underscores intraspecies nearest neighbors. (B) Duplication of ropA homologs (dark gray) frequently occurs in the vicinity of a tRNASer gene (indicated by an asterisk). Other syntenous genes are indicated in light gray.
