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Functional comparison of metagenomes from aquatic microbiomes by PCA analysis of SEED Subsystems level 1 (Meyer et al., 2008). Stromatolites PA and RM (Breitbart et al., 2009), Global Ocean Sampling (GOS) (Rusch et al., 2007), Guerrero Negro hypersaline mat (Kunin et al., 2008). The correlation of each variable with factor 1 is available as Supplementary Material, Table S2. Color images available online at www.liebertonline.com/ast
