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