Opsins are members of the guanine nucleotide-binding protein (G protein)-coupled receptor superfamily. This opsin gene is expressed in the eye, brain, testes, and spinal cord. This gene belongs to the seven-exon subfamily of mammalian opsin genes that includes peropsin (RRH) and retinal G protein coupled receptor (RGR). Like these other seven-exon opsin genes, this family member may encode a protein with photoisomerase activity. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jun 2010].
Currie, Doherty, Sillar: "Deep-brain photoreception links luminance detection to motor output in Xenopus frog tadpoles." in: Proceedings of the National Academy of Sciences of the United States of America, Vol. 113, Issue 21, pp. 6053-8, (2016) (PubMed).