This gene encodes a phosphoprotein, which is located in the outer and inner segments of the rod cells in the retina.

This protein may participate in the regulation of visual phototransduction or in the integration of photoreceptor metabolism.

It modulates the phototransduction cascade by interacting with the beta and gamma subunits of the retinal G-protein transducin.

Alternatively spliced transcript variants encoding different isoforms have been identified.

[5] This article on a gene on human chromosome 1 is a stub.