A channel is provided whereby the metallic ions can flow into {HEAD ~ the body} of {TAIL ~ water} 
of
A channel is provided whereby the metallic ions can flow into { HEAD ~ the body } of { TAIL ~ water }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL