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The most abundant operational taxonomic units (OTUs) of the classes Epsilonproteobacteria (A) and Gammaproteobacteria (C) after the 5-day anoxic incubation of nitrate-amended marine sediments (black bar) and the control (white bar). OTUs are listed in descending order of relative abundance in the NG5 library (A,C), and the transcript levels in the NT5 library are shown (B,D). White bars indicate their relative abundances in the CG5 and CT5 libraries.
