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Structure of RGS4 protein with cysteine residues represented as spheres: Cys-95 (red), Cys-71 (purple), Cys-132 (yellow), and Cys-148 (blue). α-Helices are labeled α1–9 and are adjacent to their designated location based on the Gαi1-bound RGS4 structure (1AGR) (11).
