<p>*KEGG, Kyoto Encyclopedia of Genes and Genomes (<a href="http://www.genome.jp/kegg/" target="_blank">http://www.genome.jp/kegg/</a>).</p><p>**The National Center for Biotechnology Information (<a href="http://www.ncbi.nlm.nih.gov" target="_blank">http://www.ncbi.nlm.nih.gov</a>).</p>&<p>Genes selected for further analysis.</p