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Table 3 Comparative analysis of gene gains and losses in Archaea and Bacteria

From: Updated clusters of orthologous genes for Archaea: a complex ancestor of the Archaea and the byways of horizontal gene transfer

  arCOGs bac. COGs (2003)
families 10,335 4,149
species 120 50
gains 17,680 7,769
gains/family 1.71 1.87
acquisitions/family 0.71 0.87
losses 74,690 32,355
losses/family 7.23 7.80
loss/gain ratio 4.22 4.16
single-gain (<1.5) 61% 53%