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Current knowledge of the phoD gene in the IMG/M database. (a) Proportion of sequenced genomes containing a phoD homologue. The numbers in parentheses indicate the total number of sequenced genomes in each phylum. (b) Relative abundance of phoD genes in different types of environments (normalized as the number of phoD counts per number of bases sequenced per metagenome data set). The numbers in brackets indicate the number of metagenome data sets per environment type.
