has primary input monoatomic ion channel activity https://github.com/geneontology/go-ontology/issues/24479 ion channel activity 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). molecular_function GO:0005216 monoatomic ion transmembrane transporter activity channel activity