inward rectifier potassium channel complex Kir2 inward rectifier potassium channel complex A inward rectifier potassium channel complex. Homo- or heterotetramer composed of subunits of the eukaryotic Kir2 protein family. Plays a key role in maintaining the correct resting potential in eukaryotic cells. Kir2.1 complex 2014-04-25T15:29:15Z An example of this is Kcnj2 in mouse (P35561) in PMID:16834334 (inferred from direct assay). cellular_component bhm GO:1990374