Opsins are members of the guanine nucleotide-binding protein (G protein)-coupled receptor superfamily. This gene belongs to the seven-exon subfamily of mammalian opsin genes that includes opsin 5 and retinal G protein coupled receptor.RRH (Retinal Pigment Epithelium-Derived Rhodopsin Homolog) is a Protein Coding gene. Diseases associated with RRH include Retinitis Pigmentosa 29 and Retinitis Pigmentosa, X-Linked Recessive, 6. Among its related pathways are Peptide ligand-binding receptors and Signaling by GPCR. GO annotations related to this gene include G-protein coupled receptor activity and photoreceptor activity. An important paralog of this gene is OPN4.