{TAIL ~ Electrons} may be collected using {HEAD ~ positive electrical terminals} 214, such as an anode 
{ TAIL ~ Electrons } may be collected using { HEAD ~ positive electrical terminals } 214 , such as an anode
TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH