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