Mutations in the cellular retinaldehyde–binding protein (CRALBP, encoded by
Yunlu Xue, Susan Q. Shen, Jonathan Jui, Alan C. Rupp, Leah C. Byrne, Samer Hattar, John G. Flannery, Joseph C. Corbo, Vladimir J. Kefalov
Deletion of CRALBP affects the localization of M-opsin and number of cones expressing M-opsin.