The human P2RX4 gene encodes P2X4, an ionotropic ATP receptor that functions as an ATP-activated cation channel expressed in the CNS, alveolar macrophages, vascular endothelium, and airway smooth
muscle. P2X4 receptors are therapeutic targets in treatment of neuropathic pain, asthma, and heart failure.
http://www.creative-biogene.com/Human-P2RX4-Stable-Cell-Line-HEK293-196494-12.html