The methods can be used to monitor {HEAD ~ the effects} of {TAIL ~ added external agents} on cellular membrane potential 
of
The methods can be used to monitor { HEAD ~ the effects } of { TAIL ~ added external agents } on cellular membrane potential
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH