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Table 6 Domain distribution of validated orphans

From: A survey of orphan enzyme activities

Domain No. Species Proportion
Eukaryota 156 54.36%
Eubacteria 113 39.37%
Unknown 15 5.23%
Viruses 2 0.70%
Archaea 1 0.35%
  1. Orphans with "Unknown" listed for their domain tend to be microbes that were insufficiently characterized to place them in either the Eubacteria or Archaea domains.