Arrestins (abbreviated Arr) are a family of proteins which are important in the
regulation of signal transduction G-protein coupled receptors, which at first was discovered, as part of
a conserved two step mechanism for regulating the activity of G protein-coupled receptors (GPCR) in
rhodopsin visual system by Ursula Kuhn found Scott court, and β-called Global Martin J. Lohse system and
kidney and colleagues.