Shared synteny between zebrafish and other vertebrate AHR genes. Shared synteny was analyzed using Genomicus (versions 93.0 and 100.01) (Muffato et al., 2010; Nguyen et al., 2018) with manual curation using Ensembl. The AlignView tool in Genomicus was used to visualize the syntenic relationships. Genomes for human (Homo sapiens), mouse (Mus musculus), and chicken (Gallus gallus) were used to illustrate syntenic relationships with the chromosomes containing 3 zebrafish ahr s. The panels show the shared synteny obtained when using (A) zebrafish ahr1a (chromosome 16), (B) zebrafish ahr2-ahr1b (chromosome 22), and (C) human AHR (chromosome 7) as reference genes. The genes on either side of the reference gene are shown in the correct order and orientation. Orthologs (or in some cases paralogs) of the reference gene and its flanking genes are shown in the same color, below the reference chromosome, organized by species and chromosome. The position and order of genes below the reference chromosome do not necessarily reflect their position and order on the indicated chromosome.