Figure 4From: Updated clusters of orthologous genes for Archaea: a complex ancestor of the Archaea and the byways of horizontal gene transferInferred ancestral genomes in Archaea. The square boxes at the bases of clades indicate the number of families in the inferred ancestral genomes; the rectangles at the tips of clades indicate the number of families in the extant genomes within the clade. Square boxes at the tips indicate single genomes; rectangular boxes indicate multiple genomes.Back to article page