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PMFs for the intermolecular ion pairs of the protein side-chain NH3+ and DNA phosphate groups in the Antp homeodoman–DNA complex and the Egr-1 zinc-finger–DNA complex. Red line presents the PMFs for Lys46 (Antp); green, Lys55 (Antp); blue, Lys57 (Antp); and magenta, Lys79 (Egr-1). Adapted from Chen et al. [32].
