Potassium's Path (IMAGE) Rockefeller University Caption The single large protein constituting the Slo2.2 channel has four-fold symmetry, shown above from the side. To leave the cell, a potassium ion must first pass through the gating ring (lower half) of the channel, then through the membrane-spanning domain (top half). Credit Laboratory of Molecular Neurobiology and Biophysics/Nature Usage Restrictions Image may only be used to illustrate research described in the accompanying release. 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.