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Distribution of translated BLAST prokaryotic homolog sequences. The data are organized according to prokaryotic phyla. Data for completed prokaryote genomes in GenBank (at the time of metagenome sequence comparison) are shown to illustrate groups that are overrepresented (e.g., cyanobacteria and Proteobacteria) or underrepresented (e.g., Firmicutes) in the metagenome relative to the subject database. CB, Chesapeake Bay.
