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(A). The full KcsA structure (PDB code: 1K4C) is shown in yellow ribbon, and the central K+-selective S2 binding site of the KcsA channel formed by the backbone carbonyl of Val76 and Gly77 chosen to construct the reduced reduced model consisting of four diglycine molecules. (B). The full LeuT structure (PDB code: 2A69) is shown in yellow ribbon, and the two Na+-selective binding sites Na1 and Na2 with the protein atoms incorporated into the reduced model.
