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||(1st primary source:) Researchers examined functional and evolutionary patterns in the recently constructed set of 5,873 clusters of predicted orthologs (eukaryotic orthologous groups or KOGs) from seven eukaryotic genomes
transition involved the origin of a multiplicity of new complex traits
underpinned by some 3,000 new protein families (primary sources). 3,413 eukaryotic orthologous groups according to 1st primary source.