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Nitrite reductase composition of globally distributed metagenomes. Ordinations of A) nirS and B) nirK clade composition based on detrended correspondence analysis. Each point represents the average of 100 rarefactions of 15 placements for a sample. Arrows terminate at the species score for each clade. Biomes represented by fewer than 10 samples after rarefying to 15 placements are excluded from the ordination.
