{HEAD ~ The region} of {TAIL ~ reduced hydrophobicity} can be a hydrophilic region or a superhydrophilic region 
of
{ HEAD ~ The region } of { TAIL ~ reduced hydrophobicity } can be a hydrophilic region or a superhydrophilic region
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH