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Relative abundance of taxa at the phylum/class level in the 16S rRNA gene clone and barcode libraries from sites 2 (microbial mat) and 7 (puffball). V1, V4, and V6 refer to different variable regions of the 16S rRNA gene; 454 refers to the Roche 454 GS20 (V6) or GS FLX (V4) platform; Illumina refers to the Illumina GAIIx platform. See Tables 4 and 5 for a more detailed taxonomic breakdown of the components of the different libraries.
