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Relative abundance of SSU reads. Left, cross domain relative abundance based on rRNA gene (SSU) read counts in metagenomic data sets. Right, comparison between bacterial SSU profiles from amplicon (top panels) and shotgun metagenomic (middle panels) data sets, normalized to the number of bacterial SSU copies in the metagenomic data set. The bottom panel shows the proportion of reads mapped from each metagenomic data set to genomic bins.
