As well, moveable gates can be utilized to control {HEAD ~ the flow} of metallic ions into {TAIL ~ the body} of water 
into
As well , moveable gates can be utilized to control { HEAD ~ the flow } of metallic ions into { TAIL ~ the body } of water
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH