Figure 1
From: Quantum Interference and Selectivity through Biological Ion Channels

(Left) A representation of KcsA ion channel. (Right) Two P-loop monomers in the selectivity filter, composed of the sequences of TVGYG amino acids [T(Threonine, Thr75), V(Valine, Val76), G(Glycine, Gly77), Y(Tyrosine, Tyr78), G(Glycine, Gly79)] linked by peptide units H-N-C =O20.