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 reduces the threshold of the pupillary light reflex.