Probable cation channel with high affinity for sodium. In vitro, has no proton-gated channel activity. Homotrimer or heterotrimer with other ASIC proteins. Expressed in pituitary gland. Weakly expressed in brain, vestibular system and organ of Corti. Belongs to the amiloride-sensitive sodium channel (TC 1.A.6) family. ASIC4 subfamily. Extended N-terminus. Extended N-terminus.