Orco Structure (IMAGE) Rockefeller University Caption Odorant-gated ion channels consist of four subunits symmetrically arranged around a central pore, which conducts ions. A small anchor domain connects the subunits; and the channel's outer regions detect chemicals in the environment. Credit Laboratory of Neurophysiology and Behavior Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.