Enables the facilitated diffusion of an ion (by an energy-independent process) by passage through a transmembrane aqueous pore or channel without evidence for a carrier-mediated mechanism. May be either selective (it enables passage of a specific ion only) or non-selective (it enables passage of two or more ions of same charge but different size). [ GOC:mtg_transport GOC:pr GOC:cy https://www.worldcat.org/search?q=bn%3A0815340729 ]

Enables the facilitated diffusion of a monoatomic ion (by an energy-independent process) by passage through a transmembrane aqueous pore or channel without evidence for a carrier-mediated mechanism. May be either selective (it enables passage of a specific ion only) or non-selective (it enables passage of two or more ions of same charge but different size). [ GOC:cy GOC:mtg_transport https://www.worldcat.org/search?q=bn%3A0815340729 GOC:pr ]