Altogether, more than 80% of the yeast proteins in the pan-eukaryotic, single-member KOGs belong to known macromolecular complexes included in the MIPS database [ 67 ], as compared to around 64% for all yeast proteins in the KOGs, which is a moderate but statistically highly significant excess (data not shown).
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A comprehensive evolutionary classification of proteins encoded in complete eukaryotic genomes.
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The sentences
An interesting trend seen in these data is the deterioration of the mitochondrial ribosome, which occurred in several eukaryotic lineages and appears to have been partly parallel (as it occurred independently in fungi-microsporidia and in animals) and partly consecutive: early loss in the ancestral animal line was followed by elimination of additional genes for ribosomal proteins in individual lineages (Table 6 ).