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(A) Ribbon and space-filling representations of RP-1. Charge: blue, basic (Arg, Lys) cationic residues. Amphipathicity: Kyte-Doolittle hydropathy plot; brown, most hydrophobic; green intermediate; blue most hydrophilic. Molecular imaging by Chimera [52]. (B) Helical wheel representation with polar angle subtended by hydrophilic residues as indicated.
