Figure 6From: Model of Cation Transportation Mediated by High-Affinity Potassium Transporters (HKTs) in Higher Plants Model of cation trapping and selection of plant HKTs. a) Four glycine (G) residues form a trap space and allow Na+, K+, Mg2+ and Ca2+ across. Serine (S) and three glycine (G) residues form a trap space and allow Na+ across. b) and c) Positive arginine (R) and lysine (K) residues form a cation barrier to stop cation across.Back to article page