Exon and intron structure of X. helleri LWS and SWS2 opsin genes. Gene exon and intron structures are depicted for each of the X. helleri LWS (A) and SWS2 (B) opsins described in this study. Exons for each of the genes are represented by colored boxes connected by introns depicted here as dashed black lines. Exon and intron lengths are labelled in base pairs; exon lengths are indicated directly below each exon, and intron lengths are indicated directly above each intron. (A) "five-site" haplotypes are shown for each of the four X. helleri LWS genes.
Watson et al. BMC Evolutionary Biology 2010 10:87 doi:10.1186/1471-2148-10-87