Luo DG, Silverman D, Frederiksen R, Adhikari R, Cao LH, Oatis JE, Kono M, Cornwall MC, Yau KW., 2020, “Apo-Opsin and Its Dark Constitutive Activity across Retinal Cone Subtypes.” Curr Biol. 2020 Oct 12:S0960-9822(20)31432-9. doi: 10.1016/j.cub.2020.09.062. Epub ahead of print. PMID: 33065015. PubMed