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The VS domain (PDB ID 1ORS) from KvAP. (A) Atomistic structure of the VS, showing non-H atoms only in space-filling format with the S4 helix in (pale) blue and the Arg side chains of S4 in deep blue. (B) CG model of the VS, shown in space-filling format with the S4 helix in pale blue and the Arg residues of S4 in deep blue.
