<p><b>Copyright information:</b></p><p>Taken from "Clusters of orthologous genes for 41 archaeal genomes and implications for evolutionary genomics of archaea"</p><p>http://www.biology-direct.com/content/2/1/33</p><p>Biology Direct 2007;2():33-33.</p><p>Published online 27 Nov 2007</p><p>PMCID:PMC2222616.</p><p></p> EA, Euryarchaea, CA, Crenarchaea