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Representative structures of P-loop cation channels. Adapted from Hua et al., 2003a. (A) Representation of the core primary loop of a two transmembrane/one pore P-loop channel. (B) A six transmembrane/one pore P-loop plant CNGC channel polypeptide. P designates the P-loop of the channel. (C) A representation of the secondary structure of an animal Ca2+ channel, containing four repeats of the six transmembrane/one pore structure in one large polypeptide.
