Tauroursodeoxycholic acid binds to the G-protein site on light activated rhodopsin.
Lobysheva E., Taylor C.M., Marshall G.R., & Kisselev O.G. (2018). “Tauroursodeoxycholic acid binds to the G-protein site on light activated rhodopsin.” Exp Eye Res. 2018 May;170:51-57. doi: 10.1016/j.exer.2018.02.015. Epub 2018 Feb 16. (Abstract)