Opalin, a transmembrane sialylglycoprotein located in the central nervous system myelin paranodal loop membrane.
Yoshikawa F, Sato Y, Tohyama K, Akagi T, Hashikawa T, Nagakura-Takagi Y, Sekine Y, Morita N, Baba H, Suzuki Y, et al. J Biol Chem. 2008 Jul 25; 283(30):20830-40. Epub 2008 May 19.