Supplemental methods, results, and discussion; sampling dates and locations of the cores from which FLSB mats were collected (Table S1); sampling sites for orange and white FLSB mats (Fig. S1); ORF designations (Table S2); NarH candidates (Fig. S2); inferred phylogeny, gene neighborhoods, and domain structure for the NarH-like predicted protein in Thioploca ingrica (Fig. S3); N2O production (Fig. S4).
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