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. 2019 Jun 17;85(13):e00369-19. doi: 10.1128/AEM.00369-19

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FIG 2 — PCA ordination of SAGs and genomes based on hexanucleotide (6-mer) composition (a and b) and OG composition (c and d). Genomes are colored by clade; single-cell genomes from the Red Sea (this study) are circled in black. OG counts, prior to PCA ordination, were randomly subsampled to 800 (SAR11) or 1,400 (Prochlorococcus). While both nucleotide composition and OG composition cluster genomes into discrete groups by clade, OG composition differentiates clades more clearly, as exemplified by the separation of Prochlorococcus clades LLII and LLIII (d).