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Sequence-based design (18) (A) and atomic-resolution structure (B) of abc (PDB ID code 5YAN). Salt bridges with distance d between Asp side-chain carboxylate oxygen and Lys side-chain amine nitrogen d <6 Å are denoted by black dashed lines. Salt bridges that are possible from a discrete sequence model, but are found to be weak (d > 6 Å) in the structure are denoted with yellow dashed lines. See SI Appendix for the crystallography statistics and structure details.
