Figure 1.

A schematic representation of the multiple alignments of the 33 ribosomal proteins common to Archaea and Eukarya. Purple marks segments alignable, and thus homologous, across both phylogenetic domains; blue marks segments unique and alignable only within Eukarya; red marks segments alignable only within Archaea. Dotted lines represent sequence regions of varying length that are unalignable across the full sets of either Eukarya or Archaea. The representative species are listed in the legend of Figure 4.