This gene encodes the inhibitory (or gamma) subunit of the
cone-specific cGMP phosphodiesterase, which is a tetramer composed
of two catalytic chains (alpha and beta), and two inhibitory chains
(gamma). It is specifically expressed in the retina, and is
involved in the transmission and amplification of the visual
signal. Mutations in this gene are associated with retinal cone
dystrophy type 3A (RCD3A).
