Ion channels are pore-forming proteins that help establish and control the small voltage gradient across the plasma membrane of all living cells -LRB- see cell potential -RRB- by allowing the flow of ions down their electrochemical gradient .

Ion channels are pore-forming proteins that help to establish and control the small voltage gradient across the plasma membrane of all living cells -LRB- see resting potential -RRB- by allowing the flow of ions down their electrochemical gradient .
