Genomic organization of X. helleri LWSand SWS2 opsin genes. Physical maps of LWS and SWS2 opsin gene regions sequenced from BAC clones VMRC27-186P13 containing SWS2A, SWS2B, S180-1, P180 and S180-2 opsin genes (A), and VMRC27-80H16 containing the retrotransposed S180r ospin gene and flanking GPHN exons (B). Blue, green and red boxes depict the exons of each gene. Final exons of each gene indicate transcriptional direction, and gene names are labelled above each gene. White boxes depict location of Region I and Region II (putative LCR). Approximate intergenic distances are indicated at the bottom of each map between genes.
Watson et al. BMC Evolutionary Biology 2010 10:87 doi:10.1186/1471-2148-10-87