RD3 is a human protein that is found preferentially expressed in the retina [1]. Mutations in RD3 causes Leber Congenital Amaurosis type 12 [2].

1: Identification and characterization of C1orf36, a transcript highly expressed in photoreceptor cells, and mutation analysis in retinitis pigmentosa. Lavorgna G, Lestingi M, Ziviello C, Testa F, Simonelli F, Manitto MP, Brancato R, Ferrari M, Rinaldi E, Ciccodicola A, Banfi S; Biochem Biophys Res Commun. 2003;308:414-421. PMID:12914764

2: Premature truncation of a novel protein, RD3, exhibiting subnuclear localization is associated with retinal degeneration. Friedman JS, Chang B, Kannabiran C, Chakarova C, Singh HP, Jalali S, Hawes NL, Branham K, Othman M, Filippova E, Thompson DA, Webster AR, Andreasson S, Jacobson SG, Bhattacharya SS, Heckenlively JR, Swaroop A; Am J Hum Genet. 2006;79:1059-1070. PMID:17186464