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Abstract
We have isolated a full-length cDNA encoding a putative ultraviolet (UV)-sensitive
visual pigment of the Tokay gecko (Gekko gekko). This clone has 57 and 59% sequence
similarities to the gecko RH2 and MWS pigment genes, respectively, but it shows 87%
similarity to the UV pigment gene of the American chameleon (Anolis carolinensis).
The evolutionary rates of amino acid replacement are significantly higher in the three
gecko pigments than in the corresponding chameleon pigments. The accelerated evolutionary
rates reflect not only the transition from cones to rods in the retina but also the
blue-shift in the absorption spectra of the gecko pigments.