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Wiktionary
phosducin

n. 1 A phosphoprotein found in the rod cells in the retina that modulates the phototransduction cascade by interacting with the beta and gamma subunits of the retinal G-protein transducin. 2 The gene that encodes this protein.

Wikipedia
Phosducin

Phosducin, also known as PDC, is a human protein and gene. It belongs to phosducin family of proteins.