| 3OAX: Crystal Structure Of Bovine Rhodopsin With Beta-Ionone reference: Binding of more than one retinoid to visual opsins., Makino CL, Riley CK, Looney J, Crouch RK, Okada T, Biophys J. 2010 Oct 6;99(7):2366-73. PMID: 20923672 |
This OCA 
Structure page
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(documentation).