Taxonomic classification of I. hospitalis protein-coding genes based on phylogenetic and COG distribution analyses. Genes labeled in green or blue-green are of Crenarchaeota-type or are of unresolved archaeal nature, respectively. Genes that could represent horizontal gene transfers from Euryarchaeota or Bacteria are labeled in purple and yellow, respectively. Genes that have their closest ortholog in N. equitans are labeled red and are described in the table. Genes labeled in gray lack recognizable homologues in other microbial genomes or have unresolved phylogenies preventing confident affiliation to either Archaea or Bacteria.
Podar et al. Genome Biology 2008 9:R158 doi:10.1186/gb-2008-9-11-r158