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Palczewska, G., Vinberg, F., Stremplewski, P., Bircher, M. P., Salom, D., Komar, K., … Palczewski, K. (2014). Human infrared vision is triggered by two-photon chromophore isomerization. Proceedings of the National Academy of Sciences, 111(50), E5445–E5454. doi:10.1073/pnas.1410162111 
10.1073/pnas.1410162111