Table 1.

Phylogenetic distribution of multiple AHR forms in metazoans.

This table presents a summary of our current thinking regarding AHR multiplicity and the phylogenetic distribution of various AHR forms. Results are derived from published papers and from our analyses of numerous phylogenetic trees and syntenic relationships (shared synteny). The conclusions here should be considered tentative and will be subject to revision as additional sequences and species are examined. See sections 3 and 4 of text for details regarding the different types of AHRs.

Note: bold boxes indicate a demonstrated tandem arrangement of AHR1 and AHR2 genes.

^*The classification of these as AHR3 is uncertain. Resolution will require additional sequences and synteny information.