Distribution of <i>dha</i> genes in completely sequenced Bacteria and Archaea genomes.

<p>On top, the genomic arrangement of <i>dha</i> genes present in <i>Klebsiella pneumoniae</i> is depicted; arrows indicate the direction of transcription. In parenthesis by the side of each taxonomic group, the number of total genomes analyzed within each group is given. Taxonomic groups in which <i>dha</i> genes were identified are depicted by rectangular boxes; the numbers inside indicate the number of genomes with “the complete pathway /at least one gene”, either reductive (A) or oxidative (B).