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Venn diagram depicting the number of positively selected (dN/dS > 1) orthologs between pairs of different Prochlorococcus strains. The 519 core proteins of 3 representative organisms (LL1, LL6 & HL3) were considered for the analysis. dN/dS could be calculated for 414 × 3 pairs out of the 519 × 3 pairs considered.
