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Crystal tetramer of bovine arrestin-1. (A), side view. (B), top view. PDB ID 1CF1 [24]. In each protomer arrestin-1 elements are colored, as follows: N-domain (residues 1–178), blue; inter-domain hinge (residues 179–190), yellow; C-domain (residues 191–356), green; C-tail (from residue 357; the gap reflects that part of the C-tail are invisible in crystal), red. Images were created in DS ViewerPro 6.0 (Dassault Systèmes, San Diego, CA, USA).
