Arrestin is an alias for the gene, S-antigen; retina and pineal gland (arrestin), in humans. Other names include: S-arrestin; Retinal S-antigen; S-AG; Rod photoreceptor arrestin; 48 kDa protein; arrestin 1; RP47. The encoded protein has an amino acid length of 405 and a mass of 45.1 kDa. Other isoforms may exist. Arrestin is a member of the Arrestin family. This gene shares homology with other species, including: Mouse, Frog.