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Global distribution of Zetaproteobacteria in marine sediments (circles) and non-sediment sites (triangles) such as hydrothermal vents. The relative abundance of Zetaproteobacteria in sediments from other 16S rRNA gene studies was never above 1% and was typically within the range measured from bulk marine sediments from Maine. Sequences are from numerous studies (Supplementary Table S3) that include Sanger, 454, and Illumina sequencing technologies
