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Locations of selected residues on KcsA structure. For clarity, only two KcsA subunits are shown in this RASMOL image. Space-filled residues are as follows. Violet, W26-Y45-W87-W113: markers of the lipid polar headgroup region. Yellow, Y82: position influencing cis TEA block. Green, Q58-T61-R64: positions mutated to strengthen CTX binding. Cyan, Q119: position modified by trans MTSES when mutated to cysteine.
