Assertion: membrane's channel | /r/HasProperty | specific selective
Facets:
value: for one ion
type: TRANSITIVE-OBJECT
Source sentences:
text: Most channels are specific (selective) for one ion; for example, most potassium channels are characterized by 1000:1 selectivity ratio for potassium over sodium, though potassium and sodium ions have the same charge and differ only slightly in their radius.