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Cartoon representation of the spatial arrangement of complex salt bridges in (A) barnase, studied by Horovitz et al. (1990), (B) helical peptide, studied by Mayne et al. (1998), (C) helical peptide, studied by Iqbalsyah and Doig (2005), and (D) ADA2h (this work). The values for the Θ angle and distances between Cα carbons are also given.
