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Nagata T, Koyanagi M, Tsukamoto H, Terakita A (January 2010). "Identification and characterization of a protostome homologue of peropsin from a jumping spider". Journal of Comparative Physiology A. 196 (1): 51–59. doi:10.1007/s00359-009-0493-9. PMID19960196. S2CID22879394.
Gehring WJ (January 2014). "The evolution of vision". Wiley Interdisciplinary Reviews. Developmental Biology. 3 (1): 1–40. doi:10.1002/wdev.96. PMID24902832. S2CID36881435.
Mazna P, Grycova L, Balik A, Zemkova H, Friedlova E, Obsilova V, et al. (November 2008). "The role of proline residues in the structure and function of human MT2 melatonin receptor". Journal of Pineal Research. 45 (4): 361–372. doi:10.1111/j.1600-079X.2008.00598.x. PMID18544139. S2CID6202186.
Mano H, Kojima D, Fukada Y (November 1999). "Exo-rhodopsin: a novel rhodopsin expressed in the zebrafish pineal gland". Brain Research. Molecular Brain Research. 73 (1–2): 110–118. doi:10.1016/S0169-328X(99)00242-9. PMID10581404.
Philp AR, Garcia-Fernandez JM, Soni BG, Lucas RJ, Bellingham J, Foster RG (June 2000). "Vertebrate ancient (VA) opsin and extraretinal photoreception in the Atlantic salmon (Salmo salar)". The Journal of Experimental Biology. 203 (Pt 12): 1925–1936. doi:10.1242/jeb.203.12.1925. PMID10821749.
Halford S, Freedman MS, Bellingham J, Inglis SL, Poopalasundaram S, Soni BG, et al. (March 2001). "Characterization of a novel human opsin gene with wide tissue expression and identification of embedded and flanking genes on chromosome 1q43". Genomics. 72 (2): 203–208. doi:10.1006/geno.2001.6469. PMID11401433.
Hargrave PA, McDowell JH, Curtis DR, Wang JK, Juszczak E, Fong SL, et al. (1983). "The structure of bovine rhodopsin". Biophysics of Structure and Mechanism. 9 (4): 235–244. doi:10.1007/BF00535659. PMID6342691. S2CID20407577.
Nagata T, Koyanagi M, Tsukamoto H, Terakita A (January 2010). "Identification and characterization of a protostome homologue of peropsin from a jumping spider". Journal of Comparative Physiology A. 196 (1): 51–59. doi:10.1007/s00359-009-0493-9. PMID19960196. S2CID22879394.
Gehring WJ (January 2014). "The evolution of vision". Wiley Interdisciplinary Reviews. Developmental Biology. 3 (1): 1–40. doi:10.1002/wdev.96. PMID24902832. S2CID36881435.
Mazna P, Grycova L, Balik A, Zemkova H, Friedlova E, Obsilova V, et al. (November 2008). "The role of proline residues in the structure and function of human MT2 melatonin receptor". Journal of Pineal Research. 45 (4): 361–372. doi:10.1111/j.1600-079X.2008.00598.x. PMID18544139. S2CID6202186.